Use geometry conversion helpers from AbstractClient in InternalClient
Summary:
mapFromClient and mapToClient are equivalent to clientRectToFrameRect and
frameRectToClientRect, respectively.
Test Plan: Compiles.
Reviewers: KWin, romangg
Reviewed By: KWin, romangg
Subscribers: kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D26508