[Surrey] Treat surreycpt user as if it were surreycc

The 'surreycpt' user was experience problems because it was
the only user that didn't have a matching entry in the body
table and the OPTION_SITE_NAME config.
This caused SQL problems with offline petitions, in that
the false value being returned from cobrand_admin_is_site_user
was being treated as a string in the SQL query. Adding
surreycpt to the OPTION_SITE_NAME resolved this, but still
didn't allow offline petitions to be created because there
was no body to attach them to.

This commit fixes the problem by hardcoding a special case
that treats the surreycpt as if it were the surreycc user
within cobrand_admin_is_site_user.

phplib/cobrand.php

@@ -816,8 +816,12 @@ function cobrand_rejected_petition_timeout() {
 }
 
 function cobrand_admin_is_site_user() {
+    global $site_group;
     $sites = explode(',', OPTION_SITE_NAME);
     $user = http_auth_user();
+    if ($site_group == 'surreycc' && $user == 'surreycpt') {
+        $user = 'surreycc';
+    }
     if (preg_match('#@([^.]*)\.#', $user, $m))
         $user = $m[1];
     if (in_array($user, $sites))