window: Properly destroy tooltip windows when parent window is destroyed
window: Properly destroy tooltip windows when parent window is destroyed

If we destroy a window with an active tooltip, we leave the tooltip
hanging around.  Call tooltip destructor when destroying a window.
This fixes the stuck tooltip observed when unplugging a monitor with
an active tooltip on the panel.

Closes: https://bugs.freedesktop.org/show_bug.cgi?id=72931

Tarnyko/weston-xdg_surface_present,giucam/weston,mchalupa/weston,kwm81/weston,Fantu/compositor-spice,xorgy/weston,jonnylamb/weston,xorgy/weston,sir-murray/weston,Fantu/compositor-spice,mchalupa/weston,Tarnyko/weston-xdg_surface_present,krezovic/weston,krezovic/weston,eyolfson/weston,Gnurou/weston,Fantu/compositor-spice,eyolfson/weston,udoprog/weston,udoprog/weston,sir-murray/weston,jonnylamb/weston,giucam/weston,kwm81/weston,Gnurou/weston