Fixed syntax issue in main/defaults.yml

v3.0.0 has introduced usage of the folded block scalar syntax
(see https://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html)
for the certbot_create_command variable. The usage of quotes in this
case is wrong, resulting in a command not found error.

defaults/main.yml

@@ -18,9 +18,10 @@ certbot_certs: []
 # - domains:
 #     - example3.com
 certbot_create_command: >-
-  "{{ certbot_script }} certonly --standalone --noninteractive --agree-tos
+  {{ certbot_script }} certonly --standalone --noninteractive --agree-tos
   --email {{ cert_item.email | default(certbot_admin_email) }}
-  -d {{ cert_item.domains | join(',') }}"
+  -d {{ cert_item.domains | join(',') }}
+
 certbot_create_standalone_stop_services:
   - nginx
   # - apache