shell: Move binding-modifier to shell section
shell: Move binding-modifier to shell section

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