tests: update lockdelay.py to handle the `wait` argument

Spotted by a future change.

tests/lockdelay.py

@@ -1,23 +1,23 b''
 # Dummy extension that adds a delay after acquiring a lock.
 #
 # This extension can be used to test race conditions between lock acquisition.
 
 from __future__ import absolute_import
 
 import os
 import time
 
 
 def reposetup(ui, repo):
     class delayedlockrepo(repo.__class__):
-        def lock(self):
+        def lock(self, wait=True):
             delay = float(os.environ.get('HGPRELOCKDELAY', '0.0'))
             if delay:
                 time.sleep(delay)
-            res = super(delayedlockrepo, self).lock()
+            res = super(delayedlockrepo, self).lock(wait=wait)
             delay = float(os.environ.get('HGPOSTLOCKDELAY', '0.0'))
             if delay:
                 time.sleep(delay)
             return res
 
     repo.__class__ = delayedlockrepo