[effects] Drop the Scale in effect
Summary:
It's superseded by the new scale effect(D13461).
Existing users of this effect will be migrated to the new scale effect.
Depends on D13461
Reviewers: KWin, Plasma, VDG, davidedmundson
Reviewed By: KWin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D13462