The capture group isn't used - so don't captuer it
There are no get args in the rewrite rule so there's no need to
request appending the existing get args - they are unmodified.
Because the request url was being appended as ?/$1 any nested
named parameters would be added as additional GET params. This is
yet another case where named parameters are fail. Modify the built-in
htaccess rules to not use a GET parameter at all, and just read
from REQUEST_URI.
Fixes#2678