worldclock: Fix widget size updating (#438)
worldclock: Fix widget size updating (#438)

If the content change resulted in need of different size to show all
the content, the parent widget(s) didn't get the change. This resulted
in cut text or waste of space in panel.
lxde/lxqt-panel,stefonarch/lxqt-panel,stefonarch/lxqt-panel,lxde/lxqt-panel,stefonarch/lxqt-panel