feat: kwayland:Reset position set flag if the window has been moved by seat

When the surface position is set, it can be set the the same position again, event the seat has changed the position in kwin. Because the position changed by seat, kwayland can not get the change info.

Signed-off-by: luochaojiang luochaojiang@uniontech.com Change-Id: Ia848182710239580dbc5c01f89b0d87c7dff8c0d Reviewed-on: http://gerrit.uniontech.com/c/kwayland/+/7953 Reviewed-by: mailman@uniontech.com Reviewed-by: wugang wugang@uniontech.com Reviewed-by: zhangliang zhanglianga@uniontech.com Tested-by: mailman@uniontech.com