Revert "Improve partial maximization strings"

Summary:
This reverts commit 45bf53adab9d998126037134b10492437d42e53e.

We cannot change config values for existing users since it will break
their installations.

Reviewers: KWin, davidedmundson

Reviewed By: KWin, davidedmundson

Subscribers: davidedmundson, bshah, broulik, kwin

Tags: KWin

Differential Revision: https://phabricator.kde.org/D29736