hgweb: also refresh the repo on changes to the obsstore

Before this change, hgweb could miss update to the obsolescence markers store
if that was the only change between two commands.

mercurial/hgweb/hgweb_mod.py

@@ -31,6 +31,7 b' perms = {'
 # theses files. This should probably be relocated a bit higher in core.
 foi = [('spath', '00changelog.i'),
        ('spath', 'phaseroots'), # ! phase can change content at the same size
+       ('spath', 'obsstore'),
       ]
 
 def makebreadcrumb(url, prefix=''):