Make KCheckAccelerators less invasive for apps that don't directly link to KXmlGui
Summary: BUGS: 337491
Test Plan:
Ran qtcreator and it no longer has the & in Details
Added some debug and checked that okular still gets the code called
Reviewers: anthonyfieroni
Reviewed By: anthonyfieroni
Subscribers: davidedmundson, anthonyfieroni, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D18204