Combo tab: refresh on resume

Since we're not getting events when the fragement is not displayed,
since we're unregistering from event in onPause.

app/src/main/java/info/nightscout/androidaps/plugins/PumpCombo/ComboFragment.java

@@ -69,6 +69,7 @@ public class ComboFragment extends Fragment implements View.OnClickListener {
     public void onResume() {
         super.onResume();
         MainApp.bus().register(this);
+        updateGUI();
     }
 
     @Subscribe