LCL: do not clear last adjusted clientrect

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45057 4005530d-fff6-0310-9dd1-cebe43e6787f
Qt: fixed wrong clientRect & clientOffset result when TQtWidget have assigned FOwner.issue #26175


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45059 4005530d-fff6-0310-9dd1-cebe43e6787f