Fix issue causing Godot Android apps / games to freeze on close

The issue occurred because during the 'close' event, the logic was trying to terminate the native engine on the UI thread instead of doing on the render thread.

platform/android/java/lib/src/org/godotengine/godot/Godot.kt

@@ -536,9 +536,12 @@ class Godot(private val context: Context) : SensorEventListener {
 		for (plugin in pluginRegistry.allPlugins) {
 			plugin.onMainDestroy()
 		}
+
+		runOnRenderThread {
 			GodotLib.ondestroy()
 			forceQuit()
 		}
+	}
 
 	/**
 	 * Activity result callback