Resolves #3235. Refer to the changes.

- Remove android:screenOrientation="portrait" for rotating.
- Remove override onConfigurationChanged function that does nothing.

app/src/main/AndroidManifest.xml

@@ -337,8 +337,7 @@
         <activity
             android:name=".activity.gpoddernet.GpodnetAuthenticationActivity"
             android:configChanges="orientation"
-            android:label="@string/gpodnet_auth_label"
-            android:screenOrientation="portrait">
+            android:label="@string/gpodnet_auth_label">
             <intent-filter>
                 <action android:name=".activity.gpoddernet.GpodnetAuthenticationActivity"/>
                 <category android:name="android.intent.category.DEFAULT"/>

app/src/main/java/de/danoeh/antennapod/activity/gpoddernet/GpodnetAuthenticationActivity.java

@@ -104,10 +104,6 @@ public class GpodnetAuthenticationActivity extends AppCompatActivity {
         return super.onOptionsItemSelected(item);
     }
 
-    @Override
-    public void onConfigurationChanged(Configuration newConfig) {
-    }
-
     private void setupLoginView(View view) {
         final EditText username = view.findViewById(R.id.etxtUsername);
         final EditText password = view.findViewById(R.id.etxtPassword);