Rely on lazy instantiation of text editor actions

The actions are already lazily instantiated in
TextEditorActionHandler::setupActions(), so there should be no need to
call initializeActions() in all plugins on startup. Only the main text
editor plugin will still initialize its actions, to make sure the menu
items are there.

src/plugins/cppeditor/cppplugin.cpp

@@ -225,7 +225,6 @@ void CppPlugin::writeSettings()
 
 void CppPlugin::extensionsInitialized()
 {
-    m_actionHandler->initializeActions();
 }
 
 void CppPlugin::shutdown()