Remove KIOSK_MODE_ALWAYS leftovers

We used to have a build option to start Wolvic always in kiosk mode
for some flavors (China builds). Recent changes removed the configurations
in which that option could be true, so in practice it's always false.

That's why we don't really need it. Therefore it should be deleted.

app/build.gradle

@@ -122,7 +122,6 @@ android {
         buildConfigField "Boolean", "FXA_USE_CHINA_SERVER", "false"
         buildConfigField "String[]", "SPEECH_SERVICES", "{ com.igalia.wolvic.speech.SpeechServices.MEETKAI }"
         buildConfigField "Boolean", "SUPPORTS_SYSTEM_NOTIFICATIONS", "false"
-        buildConfigField "Boolean", "KIOSK_MODE_ALWAYS", "false"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {

app/src/common/shared/com/igalia/wolvic/VRBrowserActivity.java

@@ -827,18 +827,6 @@ void loadFromIntent(final Intent intent) {
             openInKioskMode = extras.getBoolean("kiosk", false);
         }
 
-        // In some variants Wolvic will always open in kiosk mode.
-        if (BuildConfig.KIOSK_MODE_ALWAYS) {
-            openInKioskMode = true;
-            if (targetUri == null) {
-                // If we don't have a target URI we will load the default homepage in kiosk mode,
-                // unless we are already showing a website in kiosk mode.
-                WindowWidget window = mWindows.getFocusedWindow();
-                if (window == null || !window.isKioskMode() || window.isCurrentUriBlank())
-                    targetUri = Uri.parse(getString(R.string.homepage_url));
-            }
-        }
-
         // If there is a target URI we open it
         if (targetUri != null) {
             Log.d(LOGTAG, "Loading URI from intent: " + targetUri);