Fix missing klint errors. (#1751)

Comprehensive list obtained by running:

```
for arg in $(./gradlew tasks --all | grep :ktx:ktlintMainSourceSetCheck | awk '{print $1}')
do
  ./gradlew -q $arg
done
```

Author: rlazo

firebase-database/ktx/src/main/kotlin/com/google/firebase/database/ktx/Database.kt

@@ -16,13 +16,12 @@ package com.google.firebase.database.ktx
 
 import androidx.annotation.Keep
 import com.google.firebase.FirebaseApp
-import com.google.firebase.database.DataSnapshot
-import com.google.firebase.database.GenericTypeIndicator
-import com.google.firebase.database.FirebaseDatabase
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
+import com.google.firebase.database.DataSnapshot
+import com.google.firebase.database.FirebaseDatabase
+import com.google.firebase.database.GenericTypeIndicator
 import com.google.firebase.database.MutableData
-
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-dynamic-links/ktx/src/main/kotlin/com/google/firebase/dynamiclinks/ktx/FirebaseDynamicLinks.kt

@@ -17,12 +17,11 @@ package com.google.firebase.dynamiclinks.ktx
 import androidx.annotation.Keep
 import com.google.android.gms.tasks.Task
 import com.google.firebase.FirebaseApp
-import com.google.firebase.dynamiclinks.FirebaseDynamicLinks
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
 import com.google.firebase.dynamiclinks.DynamicLink
+import com.google.firebase.dynamiclinks.FirebaseDynamicLinks
 import com.google.firebase.dynamiclinks.ShortDynamicLink
-
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-firestore/ktx/src/main/kotlin/com/google/firebase/firestore/ktx/Firestore.kt

@@ -21,10 +21,9 @@ import com.google.firebase.components.ComponentRegistrar
 import com.google.firebase.firestore.DocumentSnapshot
 import com.google.firebase.firestore.FieldPath
 import com.google.firebase.firestore.FirebaseFirestore
+import com.google.firebase.firestore.FirebaseFirestoreSettings
 import com.google.firebase.firestore.QueryDocumentSnapshot
 import com.google.firebase.firestore.QuerySnapshot
-import com.google.firebase.firestore.FirebaseFirestoreSettings
-
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-functions/ktx/src/main/kotlin/com/google/firebase/functions/ktx/Functions.kt

@@ -16,10 +16,9 @@ package com.google.firebase.functions.ktx
 
 import androidx.annotation.Keep
 import com.google.firebase.FirebaseApp
-import com.google.firebase.functions.FirebaseFunctions
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
-
+import com.google.firebase.functions.FirebaseFunctions
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-inappmessaging-display/ktx/src/main/kotlin/com/google/firebase/inappmessaging/display/ktx/InAppMessagingDisplay.kt

@@ -16,9 +16,9 @@ package com.google.firebase.inappmessaging.display.ktx
 
 import androidx.annotation.Keep
 import com.google.firebase.FirebaseApp
-import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplay
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
+import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplay
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-inappmessaging/ktx/src/main/kotlin/com/google/firebase/inappmessaging/ktx/InAppMessaging.kt

@@ -16,10 +16,9 @@ package com.google.firebase.inappmessaging.ktx
 
 import androidx.annotation.Keep
 import com.google.firebase.FirebaseApp
-import com.google.firebase.inappmessaging.FirebaseInAppMessaging
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
-
+import com.google.firebase.inappmessaging.FirebaseInAppMessaging
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
 

firebase-storage/ktx/src/main/kotlin/com/google/firebase/storage/ktx/Storage.kt

@@ -16,13 +16,12 @@ package com.google.firebase.storage.ktx
 
 import androidx.annotation.Keep
 import com.google.firebase.FirebaseApp
-import com.google.firebase.storage.FirebaseStorage
-import com.google.firebase.storage.StorageMetadata
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
-
 import com.google.firebase.ktx.Firebase
 import com.google.firebase.platforminfo.LibraryVersionComponent
+import com.google.firebase.storage.FirebaseStorage
+import com.google.firebase.storage.StorageMetadata
 
 /** Returns the [FirebaseStorage] instance of the default [FirebaseApp]. */
 val Firebase.storage: FirebaseStorage