roles: use longer format for when conditionals

When the condition is an AND we can use this more succinct format.

roles/nginx/tasks/letsencrypt.yml

@@ -44,7 +44,9 @@
     ansible.builtin.file:
       dest: "{{ letsencrypt_acme_script_temp }}"
       state: absent
-    when: acme_install.rc is defined and acme_install.rc == 0
+    when:
+      - acme_install.rc is defined
+      - acme_install.rc == 0
 
   - name: Set default certificate authority for acme.sh
     ansible.builtin.command: