fix(zone.xml): fix jinja error in rule.reject

firewalld/files/zone.xml

@@ -63,7 +63,7 @@
     <accept>{%- if rule.accept is mapping and 'limit' in rule.accept %} <limit value="{{ rule.accept.limit }}"/>{%- endif %}</accept>
   {%- endif %}
   {%- if 'reject' in rule %}
-    <reject{%- if 'type' in rule.reject %} type="{{ rule.reject.type }}"{%- endif %} />
+    <reject{%- if rule.reject is mapping and 'type' in rule.reject %} type="{{ rule.reject.type }}"{%- endif %} />
   {%- endif %}
   {%- if 'drop' in rule %}
     <drop/>