bookmark: remove the "touch changelog" hack

Any changes to bookmarks used to touch the changelog to ensure hgweb was
reloaded. This was fairly hacky and stops working when bookmarks are moved as
part of the transaction. As hgweb is now explicitly tracking bookmark changes,
we can remove this hack (and no tests break).

mercurial/bookmarks.py

@@ -94,12 +94,6 b' class bmstore(dict):'
             self._write(file)
             file.close()
 
-            # touch 00changelog.i so hgweb reloads bookmarks (no lock needed)
-            try:
-                repo.svfs.utime('00changelog.i', None)
-            except OSError:
-                pass
-
         finally:
             wlock.release()