Removed ssl_trusted_certificate configuration setting from nginx.

Resolves an nginx startup issue when letsencrypt or
mail-letsencrypt is enabled.

Fixes #2199

core/nginx/conf/tls.conf

@@ -3,7 +3,6 @@ ssl_certificate_key {{ TLS[1] }};
 {% if TLS_FLAVOR in ['letsencrypt','mail-letsencrypt'] %}
 ssl_certificate {{ TLS[2] }};
 ssl_certificate_key {{ TLS[3] }};
-ssl_trusted_certificate /etc/ssl/certs/ca-cert-DST_Root_CA_X3.pem;
 {% endif %}
 ssl_session_timeout 1d;
 ssl_session_tickets off;

towncrier/newsfragments/2199.bugfix

@@ -0,0 +1 @@
+Removed `ssl_trusted_certificate` configuration setting from nginx. Fixes an issue with nginx when letsencrypt or mail-letsencrypt is used.