serve: pass the prepared baseui to hgweb

The baseui was carefully prepared but not used.
ui can contain repo specific settings which can have unwanted effects.

mercurial/commands.py

@@ -5093,7 +5093,7 b' def serve(ui, repo, **opts):'
                                     " here (.hg not found)"))
         o = repo.root
 
-    app = hgweb.hgweb(o, baseui=ui)
+    app = hgweb.hgweb(o, baseui=baseui)
 
     class service(object):
         def init(self):