fix updating panel geometry on screen changes
fix updating panel geometry on screen changes

cferr/lxqt-panel,ThomasVie/lxqt-panel-de,lxde/lxqt-panel,pmattern/lxqt-panel,stefonarch/lxqt-panel,lxde/lxqt-panel,stefonarch/lxqt-panel,stefonarch/lxqt-panel,Ilya87/lxqt-panel,ThomasVie/lxqt-panel-de,pmattern/lxqt-panel,Ilya87/lxqt-panel,cferr/lxqt-panel