hgweb: trust config file passed into hgwebdir

Before this patch, hgwebdir suddenly showed up empty for a webdir-conf file
that was for some reason not trusted. This was previously not a problem because
the trust mechanism wasn't required for the very separate webdir-conf.

mercurial/hgweb/hgwebdir_mod.py

@@ -35,7 +35,7 b' class hgwebdir(object):'
         elif isinstance(conf, dict):
             self.repos = sorted(cleannames(conf.items()))
         else:
-            self.ui.readconfig(conf, remap={'paths': 'hgweb-paths'})
+            self.ui.readconfig(conf, remap={'paths': 'hgweb-paths'}, trust=True)
             self.repos = []
 
         self.motd = self.ui.config('web', 'motd')