states: peer_present: set endpoint

_states/wireguard.py

         ret['result'] = True
         return ret
 
-    if show.get('endpoint') and endpoint and show.get('endpoint') != endpoint:
+    if endpoint and show.get('endpoint', '') != endpoint:
         __salt__['wg.set'](interface, peer=name, endpoint=endpoint)
         ret['changes']['endpoint'] = dict(
                 old=show.get('endpoint'), new=endpoint)