[apps] Don't forget to call viewWillAppear

At the moment ViewController::viewWillAppear doesn't do anything, so
there is no real impact. But if we want to use it it needs to be called
from subclasses.

apps/code/menu_controller.cpp

@@ -79,6 +79,7 @@ void MenuController::didBecomeFirstResponder() {
 }
 
 void MenuController::viewWillAppear() {
+  ViewController::viewWillAppear();
   updateAddScriptRowDisplay();
 }