Remove unused private members

Found by Clang 3.6:
messageeditorwidgets.cpp:250:14: warning: private field 'm_wrapee' is not used [-Wunused-private-field]
cpp.cpp:309:15: warning: private field 'yyInteger' is not used [-Wunused-private-field]

Change-Id: Ice6aa515123b1ac375816271362772d50b9b8f27
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>