set visibility from ActivityViewHeaderHolder back to protected

Signed-off-by: alex <alex.plutta@googlemail.com>
Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/ui/activities/ActivitiesActivity.java

@@ -174,7 +174,7 @@ public class ActivitiesActivity extends FileActivity implements ActivityListInte
         LinearLayoutManager layoutManager = new LinearLayoutManager(this);
 
         recyclerView.setLayoutManager(layoutManager);
-        recyclerView.addItemDecoration(new ActivityListItemDecoration( adapter));
+        recyclerView.addItemDecoration(new ActivityListItemDecoration(adapter));
         recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
 
             @Override

src/main/java/com/owncloud/android/ui/adapter/ActivityListAdapter.java

@@ -478,7 +478,7 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
         }
     }
 
-    public class ActivityViewHeaderHolder extends RecyclerView.ViewHolder {
+    protected class ActivityViewHeaderHolder extends RecyclerView.ViewHolder {
 
         private final TextView title;