unnecesary code removed

- setContentView removed
- R.layout.redirect_import_keys_activity.xml removed

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/RedirectImportKeysActivity.java

@@ -29,7 +29,6 @@ public class RedirectImportKeysActivity extends BaseActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setContentView(R.layout.redirect_import_keys_activity);
 
         startQrCodeCaptureActivity();
     }