android: handle onActivityResult Activity lifecycle method

It may be called in the Activity instead of in the Fragment. Handle both.

android/app/src/main/java/org/jitsi/meet/MainActivity.java

     //
 
     @Override
-    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == OVERLAY_PERMISSION_REQUEST_CODE
                 && canRequestOverlayPermission()) {
             if (Settings.canDrawOverlays(this)) {

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetActivity.java

     // Activity lifecycle methods
     //
 
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        JitsiMeetActivityDelegate.onActivityResult(this, requestCode, resultCode, data);
+    }
+
     @Override
     public void onBackPressed() {
         JitsiMeetActivityDelegate.onBackPressed();

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetFragment.java

 import android.view.View;
 import android.view.ViewGroup;
 
-import java.net.URL;
-
 /**
  * Base {@link Fragment} for applications integrating Jitsi Meet at a higher level. It
  * contains all the required wiring between the {@code JitsiMeetView} and