Remove call to register plugins

It's handled by the call to `super`

android/app/src/main/kotlin/net/defined/mobile_nebula/MainActivity.kt

@@ -59,8 +59,6 @@ class MainActivity: FlutterActivity() {
         //TODO: Initializing in the constructor leads to a context lacking info we need, figure out the right way to do this
         sites = Sites(flutterEngine)
         
-        GeneratedPluginRegistrant.registerWith(flutterEngine)
-
         ui = MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL)
         ui!!.setMethodCallHandler { call, result ->
             when(call.method) {