debuglock: access the lock file using the proper vfs

Before this fix, 'wlock' was always reported as "free" because '.hg/store/wlock'
have never been a thing.

mercurial/commands.py

@@ -2484,7 +2484,7 b' def debuglocks(ui, repo, **opts):'
             l.release()
         else:
             try:
-                stat = repo.svfs.lstat(name)
+                stat = vfs.lstat(name)
                 age = now - stat.st_mtime
                 user = util.username(stat.st_uid)
                 locker = vfs.readlock(name)