Don't listen for the same broadcast events twice.

Caused crashes when we incorrectly provided info to the recyler view
about which items had been added/removed.

app/src/main/java/org/fdroid/fdroid/views/main/MainViewAdapter.java

@@ -69,7 +69,8 @@ class MainViewAdapter extends RecyclerView.Adapter<MainViewController> {
                 holder.bindSwapView();
                 break;
             case R.id.updates:
-                holder.bindUpdates();
+                // Hold of until onViewAttachedToWindow, because that is where we want to start listening
+                // for broadcast events (which is what the data binding does).
                 break;
             case R.id.settings:
                 holder.bindSettingsView();