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();
     }

OpenKeychain/src/main/res/layout/redirect_import_keys_activity.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-</RelativeLayout>