dehydrated: use tls_extra_hostnames variable instead of extra_hostnames

tasks/dehydrated.yml

@@ -20,7 +20,7 @@
 
 - name: "Configure dehydrated: domains.txt"
   copy:
-    content: "{{ inventory_hostname }}{% if extra_hostnames is defined %}{% for hostname in extra_hostnames %} {{ hostname }}{% endfor %}{% endif %}"
+    content: "{{ inventory_hostname }}{% if tls_extra_hostnames is defined %}{% for hostname in tls_extra_hostnames %} {{ hostname }}{% endfor %}{% endif %}"
     dest: /etc/dehydrated/domains.txt
   register: dehydomains