path: pass `path` to `peer` in `hg perf::discovery`

We directly use the `path` object to build the `peer` object.

contrib/perf.py

@@ -997,6 +997,11 b' def perfdiscovery(ui, repo, path, **opts'
     timer, fm = gettimer(ui, opts)
 
     try:
+        from mercurial.utils.urlutil import get_unique_pull_path_obj
+
+        path = get_unique_pull_path_obj(b'perfdiscovery', ui, path)
+    except ImportError:
+        try:
         from mercurial.utils.urlutil import get_unique_pull_path
 
         path = get_unique_pull_path(b'perfdiscovery', repo, ui, path)[0]