T4502: Fix syntax error introduced by #2062

When rebasing https://github.com/vyos/vyos-1x/pull/2062, some additional
lines are mistakenly included.

https://github.com/vyos/vyos-1x/commit/45cfd569119b66abd2f0dfb954042b57921881bd
has removed the extra }, but the `{{ group_tmpl.groups(group, True)
}}` line needs to be removed as well.