[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/editor_controller.cpp

@@ -59,6 +59,7 @@ void EditorController::didBecomeFirstResponder() {
 }
 
 void EditorController::viewWillAppear() {
+  ViewController::viewWillAppear();
   m_editorView.loadSyntaxHighlighter();
   m_editorView.setCursorLocation(m_editorView.text() + strlen(m_editorView.text()));
 }