shell: Don't ping internal shell surfaces
shell: Don't ping internal shell surfaces

This is a hack for now to get xserver surfaces working again.

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