xwm: Use SUBSTRUCTURE_REDIRECT on frame window too
xwm: Use SUBSTRUCTURE_REDIRECT on frame window too

This lets us intercept and handle client attempts to resize their window
within the frame window.

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