Adjusts the parameters passed to context to be passed as json and hopefully avoid double quoting. Also brings indentation in-line with salt doc 23.14.1.2.1

nginx/ng/config.sls

     - source: salt://nginx/ng/files/nginx.conf
     - template: jinja
     - context:
-      config: {{ nginx.server.config }}
+        config: {{ nginx.server.config|json() }}

nginx/ng/vhosts_config.sls

     - source: salt://nginx/ng/files/vhost.conf
     - template: jinja
     - context:
-      config: {{ settings.config }}
+        config: {{ settings.config|json() }}
 {% do vhost_states.append(conf_state_id) %}
 {% endif %}