Test Plan:
Tested output piping test lines into the script with different settings
Removed from my kdeglobals
Invoked script. New value appeared
(note that if you manually test multiple times locally you have to
cleanup the $version info from
both kdeglobals and kwinrc or the migration will be skipped)
Reviewers: zzag
Reviewed By: zzag
Subscribers: zzag, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D24084
