Removed pebble symbol from Unciv icon when showing persistent notification (#2003)

Optimized Notification service texts
https://github.com/yairm210/Unciv/issues/1680

android/src/com/unciv/app/AndroidLauncher.kt

@@ -12,7 +12,7 @@ import java.io.File
 class AndroidLauncher : AndroidApplication() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        createNotificationChannels()
+        MultiplayerTurnCheckWorker.createNotificationChannels(applicationContext)
 
 		// Only allow mods on KK+, to avoid READ_EXTERNAL_STORAGE permission earlier versions need
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
@@ -26,14 +26,6 @@ class AndroidLauncher : AndroidApplication() {
         initialize(game, config)
     }
 
-    /**
-     * Necessary for Multiplayer Turner Checker, starting with Android Oreo
-     */
-    private fun createNotificationChannels() {
-        MultiplayerTurnCheckWorker.createNotificationChannelInfo(context)
-        MultiplayerTurnCheckWorker.createNotificationChannelService(context)
-    }
-
 	/**
 	 * Copies mods from external data directory (where users can access) to the private one (where
 	 * libGDX reads from). Note: deletes all files currently in the private mod directory and