Binding "Cancel Ability" and Crouch to the same key conflict on the zipline

[ribbanya]

If both are bound to the same key, pressing it causes you to jump off the zipline (because by default Jump and Cancel are the same key), so you no longer have access to the crouch-from-zipline behavior. Crouch should take priority because pressing Jump will let you do the default Cancel behavior.

Related to #25950.