[kcmkwin/compositing] Use ellipsis in Desktop Effects kcm
Summary: This patch introduces the ellipsis used in Krunner, Kicker, Kickoff and Clipboard to Desktop Effects (Kwin).
Test Plan:
Before:
After:
Reviewers: ngraham, VDG, KWin, davidedmundson
Reviewed By: ngraham, VDG, KWin, davidedmundson
Subscribers: kwin
Tags: KWin
Maniphest Tasks: T10258
Differential Revision: https://phabricator.kde.org/D17937