URLs in Issues are incorrect when accessing via custom subdomain

When urls are generated in the issue tracker and commit logs (i.e. reference to a ticket number, change set, etc.) they point to a 404 url when accessed via a custom subdomain.

The url is incorrectly including the account name when accessed via the account's custom subdomain. (e.g. http://git.pickslide.ca/pickslide/fpigallery/changeset/e00cfbe8a6e4 instead of http://git.pickslide.ca/fpigallery/changeset/e00cfbe8a6e4 )