roles/nginx: Just enable OCSP

I was attempting to make the config easier to use in test environments
where the key is self-signed, but meh, I rarely do that and I think
this logic doesn't actually work.

Signed-off-by: Alan Orth <alan.orth@gmail.com>

roles/nginx/templates/https.j2

@@ -14,13 +14,10 @@
     ssl_ciphers "{{ tls_cipher_suite }}";
     ssl_prefer_server_ciphers on;
 
-{# don't use OCSP stapling if we're using a self-signed cert #}
-{% if tls_cert is defined %}
     # OCSP stapling...
     ssl_stapling on;
     ssl_stapling_verify on;
     resolver 208.67.222.222 208.67.220.220;
-{% endif %}
 
     # nginx does not auto-rotate session ticket keys: only a HUP / restart will do so and
     # when a restart is performed the previous key is lost, which resets all previous