xdg-shell: add invalid_resize_edge error value

The protocol states that the edges parameter of the resize request must
be one of the values of the resize_edge enum but does not provide a
protocol error value to handle the case where it is not. This commit
adds that error value.

Signed-off-by: Isaac Freund <mail@isaacfreund.com>
3 jobs for xdg-toplevel-resize-edge-error in 1 minute and 4 seconds (queued for 1 second)