Reparse rules config prior to update
Summary:
We used to recreate the KConfig when rules needed to update. Now that it
is a KSharedConfig, which is kept, it needs to be reparsed as it changes
outside of KWin.
BUG: 393788
FIXED-IN: 5.13.0
Test Plan: Restarted session, changing rules work again
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D12706