hgweb: Respond with HTTP 403 for disabled archive types instead of 404
This makes it easier for clients/users to distinct between supported
but disabled and unsupported archive types.
#!/bin/shhghg -qhg helphg -q helphg add -hhg add --skjdfkshg help diffhg help statushg -q help statushg help foohg skjdfksexit 0