extensions/weston: Don't delete wl_resource anymore

wl_resource's are now opaque in Wayland 1.2 and lifetime managed by
the wayland server library.

However, for Wayland < 1.2 (1.1.90) we should delete them... but for
now just let it leak until we have time to fix this (i.e. do a
compile time version check) :-/.

Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>