use nextcloud_database_host as host name

tasks/mysql.yml

@@ -3,7 +3,7 @@
 - name: mysql user
   mysql_user:
     name: "{{ nextcloud_database_user }}"
-    host: "{{ (nextcloud_database_host == inventory_hostname) | ternary('localhost',ssh_ip) }}"
+    host: "{{ (nextcloud_database_host == inventory_hostname) | ternary('localhost',nextcloud_database_host) }}"
     password: "{{ nextcloud_database_pass }}"
     priv: "{{nextcloud_database_name}}.*:ALL"
   delegate_to: "{{ nextcloud_database_host }}"