tiling: Don't put maximized windows in tile
After !5532 (merged) existing behavior in public scripting API was changed for maximized Windows. Maximized Windows didn't have a tile on purpose. This behaviour was changed, as after refactoring separate members for storing QuickTileMode in Window and tile itself were unified Previously QuickTileMode::Maximize was only set in the Window itself in m_quickTileMode, while tile itself was removed (by setTile(nullptr)).
Current QuickTileMod for current Window isn't part of public scripting API, so it's okay to break it.
This restores compatability with scripts created for KWin 6.0.5 and earlier
Signed-off-by: Alik Aslanyan inline0@pm.me
(cherry picked from commit 3b34e930)
Co-authored-by: Alik Aslanyan inline0@pm.me