Fix typo in salt-api ssl setup

salt/files/_api.conf

   ssl_key: /etc/ssl/private/{{ system.name }}.{{ system.domain }}.key
   {%- else %}
   ssl_crt: {{ api.ssl.get('cert_file')|default("/etc/ssl/certs/"+grains.get('fqdn')+".crt") }}
-  ssl_crt: {{ api.ssl.get('key_file')|default("/etc/ssl/private/"+grains.get('fqdn')+".key") }}
+  ssl_key: {{ api.ssl.get('key_file')|default("/etc/ssl/private/"+grains.get('fqdn')+".key") }}
   {%- endif %}
   {%- else %}
   disable_ssl: True
   {%- if api.get('debug', False) %}
   debug: True
   {%- endif %}
+{#-
+  vim: syntax=jinja
+-#}