Searx template - added variable set_real_ip when using additional reverse proxy (#54)

When using reverse rpoxy in front of searx and using limiter (or filtron) we need to be able to pass on client real ip.

Co-authored-by: muppeth <muppeth@disroot.org>
Reviewed-on: #54
Reviewed-by: meaz <meaz@no-reply@disroot.org>

templates/etc/nginx/sites-available/searx.j2

@@ -2,6 +2,9 @@
 
 {%block root %}
   root {{ searx_app_dir }}/searx;
+{% if item.real_ip_from is defined %}
+set_real_ip_from {{ item.real_ip_from }};
+{% endif %}
 {% endblock %}
 
 {% block location %}