[flutter_local_notifications] remove redundant commit to shared prefs…

… logic and checks for commit during initialisation (#1389)

* remove redundant commit

* update commit logic for initialisation

flutter_local_notifications/android/src/main/java/com/dexterous/flutterlocalnotifications/FlutterLocalNotificationsPlugin.java

@@ -366,10 +366,6 @@ private static void saveScheduledNotifications(
   }
 
   private static void commitAsync(final SharedPreferences.Editor editor, final Result result) {
-    if (executor == null || handler == null) {
-      editor.commit();
-      return;
-    }
     executor.execute(
         new Runnable() {
           @Override
@@ -1411,7 +1407,11 @@ private void initialize(MethodCall call, Result result) {
         applicationContext.getSharedPreferences(SHARED_PREFERENCES_KEY, Context.MODE_PRIVATE);
     SharedPreferences.Editor editor = sharedPreferences.edit();
     editor.putString(DEFAULT_ICON, defaultIcon);
-    commitAsync(editor, result);
+    if (executor != null && handler != null) {
+      commitAsync(editor, result);
+    } else {
+      editor.commit();
+    }
   }
 
   /// Extracts the details of the notifications passed from the Flutter side and also validates that