Adding lazy load check for `s2-ssl` in an effort to detect the use of Pro Forms (or other s2Member functionality) ; even when Pro Forms are loaded via custom template files. As long as `s2-ssl=yes` is applied to the request, s2Member's CSS/JS will now load with this improvement.

If you are attempting to load Pro Forms via custom WordPress template files, you can also resort to this handy filter. `add_filter('ws_plugin__s2member_lazy_load_css_js', '__return_true');`. Be sure to attach this filter on the `init` action in WordPress.