localrepo: use urllocalpath() for path to create repo too

It looks like this was lost in 7ce9dea3a14a (localrepo: move repo
creation logic out of localrepository.__init__ (API), 2018-09-11). I
don't know when it makes a difference (maybe on Windows, since
urllocalpath() mentions something about drive letters).

Differential Revision: https://phab.mercurial-scm.org/D4550

mercurial/localrepo.py

@@ -2377,10 +2377,11 b' def undoname(fn):'
     return os.path.join(base, name.replace('journal', 'undo', 1))
 
 def instance(ui, path, create, intents=None, createopts=None):
+    localpath = util.urllocalpath(path)
     if create:
-        createrepository(ui, path, createopts=createopts)
+        createrepository(ui, localpath, createopts=createopts)
 
-    return localrepository(ui, util.urllocalpath(path), intents=intents)
+    return localrepository(ui, localpath, intents=intents)
 
 def islocal(path):
     return True