worldclock: Fix popup showing after closed
worldclock: Fix popup showing after closed

After @740b024 the deactivated signal wasn't emitted at all (window type changed).

rbazaud/lxqt-panel,stefonarch/lxqt-panel,stefonarch/lxqt-panel,Ilya87/lxqt-panel,stefonarch/lxqt-panel,jeremywh7/lxqt-panel,pmattern/lxqt-panel,lxde/lxqt-panel,cferr/lxqt-panel,jubalh/lxqt-panel,pmattern/lxqt-panel,jubalh/lxqt-panel,DrTobe/lxqt-panel,ThomasVie/lxqt-panel-de,lxde/lxqt-panel,jeremywh7/lxqt-panel,rbazaud/lxqt-panel,Ilya87/lxqt-panel,ThomasVie/lxqt-panel-de,DrTobe/lxqt-panel,cferr/lxqt-panel