clone: use `get_clone_path`

"Surprisingly", the new API is well suited for `hg clone` too.

Differential Revision: https://phab.mercurial-scm.org/D10417

mercurial/hg.py

@@ -689,7 +689,7 b' def clone('
             if dest:
                 ui.status(_(b"destination directory: %s\n") % dest)
         else:
-            dest = ui.expandpath(dest)
+            dest = urlutil.get_clone_path(ui, dest)[0]
 
         dest = urlutil.urllocalpath(dest)
         source = urlutil.urllocalpath(source)