desktop-shell: Activate surface on right click too
desktop-shell: Activate surface on right click too

This raises the surface to the top on right click as well, which fixes
pop stacking.

https://bugs.freedesktop.org/show_bug.cgi?id=74831

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