Shortened variable prefix; Fixed Nextcloud integration

tasks/main.yml

@@ -55,7 +55,7 @@
 - name: "Test whether the service is healthy from the public internet"
   become: false
   uri:
-    url: https://{{ onlyoffice_document_server_virtual_host }}
+    url: https://{{ onlyoffice_virtual_host }}
     timeout: 300
     validate_certs: no
   register: url_check