Make plugin pick up Qt wayland extensions

I forgot to change the strings when I renamed them

Change-Id: I76f52c12b5724c4ad4513723fd443f71ff745484
Reviewed-by: Andy Nichols <andy.nichols@digia.com>
Remove dead functions

Change-Id: I99b1ea870729760976e3b930eec4ac8a96517efa
Reviewed-by: Andy Nichols <andy.nichols@digia.com>