hgweb: regenerate web substitutions when repo is refreshed

hgweb: regenerate web substitutions when repo is refreshed

Previously, changes to the configuration would not be picked up by a
running server. That feels like a bug. Regenerate the web substitutions
table when the repository changes.

--- a/mercurial/hgweb/hgweb_mod.py	Wed Sep 09 09:07:27 2015 -0700
+++ b/mercurial/hgweb/hgweb_mod.py	Sat Aug 22 16:41:02 2015 -0700
@@ -238,7 +238,6 @@
         self.repostate = None
         self.mtime = -1
         self.reponame = name
-        self.websubtable = webutil.getwebsubs(r)
 
     def _getview(self, repo):
         """The 'web.view' config controls changeset filter to hgweb. Possible
@@ -280,6 +279,8 @@
             # mtime is needed for ETag
             self.mtime = mtime
 
+            self.websubtable = webutil.getwebsubs(r)
+
     def run(self):
         """Start a server from CGI environment.