Stop overriding settings menu

In the past this was done to not have the Full Screen action appear
there. However this was changed globally three years ago in
frameworks/kxmlgui@93455f78
and as such we haven't needed to do it anymore in Gwenview since then.

BUG: 473672
FIXED-IN: 23.08.1


(cherry picked from commit c63b26c1)