Small improvement

app/src/main/java/eu/faircode/email/FragmentFolder.java

@@ -134,7 +134,7 @@ public class FragmentFolder extends Fragment {
         @NonNull
         @Override
         public Loader<Throwable> onCreateLoader(int id, Bundle args) {
-            PutLoader loader = new PutLoader(getActivity());
+            PutLoader loader = new PutLoader(getContext());
             loader.setArgs(args);
             return loader;
         }