Minor fixes, style

* make sure ATC view is updated when disconnected
* prepared rounding, can be enabled at any time

src/blackgui/components/atcstationcomponent.cpp

@@ -351,6 +351,7 @@ namespace BlackGui
             {
                 m_updateTimer.stop();
                 this->clearOnlineViews();
+                this->update();
             }
         }