Embedded Capacitor: Remove unused interaction listener

[fkirc]

When integrating embedded Capacitor, one of the first errors is RuntimeException: activity must implement OnFragmentInteractionListener.
To fix this exception, one needs to implement BridgeFragment.onFragmentInteractionListener like so:

import android.net.Uri;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import com.getcapacitor.BridgeFragment;

public class MainActivity extends AppCompatActivity implements BridgeFragment.OnFragmentInteractionListener {
  @Override
  public void onFragmentInteraction(Uri uri) {
    // This is never ever called!
  }
}

However, this listener gets not called anywhere. Therefore, this listener needlessly confuses the integration process for embedded Capacitor.
If someone wants to use a working listener like this, then it is possible to subclass BridgeFragment.