Summary:
Caused icons to be not longer recolored when changing the color scheme until an
application is started again

Test Plan: Change color scheme while having an application open, icons should change color correctly

Reviewers: #breeze, #plasma, ndavis

Reviewed By: #breeze, ndavis

Subscribers: ndavis, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D29012