fix(android): remove duplicate unbindService call in onDestroy

The service is already unbound in onStop(), so calling unbindService()
again in onDestroy() causes "Service not registered" error. Remove the
duplicate unbind call since onStop() is called before onDestroy().

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: teng-lin

android/app/src/main/java/me/kavishdevar/librepods/MainActivity.kt

@@ -164,14 +164,6 @@ class MainActivity : ComponentActivity() {
     }
 
     override fun onDestroy() {
-        try {
-            if (::serviceConnection.isInitialized) {
-                unbindService(serviceConnection)
-                Log.d("MainActivity", "Unbound service")
-            }
-        } catch (e: Exception) {
-            Log.e("MainActivity", "Error while unbinding service: $e")
-        }
         try {
             if (::connectionStatusReceiver.isInitialized) {
                 unregisterReceiver(connectionStatusReceiver)