Fixed some db issues due to delegation

!9 (merged) introduced some issues during upgrade as delegation to localhost (the host executing the playbook) would not work when you try to apply the playbook on a remote host.

defaults/main.yml

@@ -14,8 +14,8 @@ funkwhale_database_managed: true
 funkwhale_database_local: true
 funkwhale_database_name: funkwhale
 funkwhale_database_user: funkwhale
-# the DB host as per your ansible inventory
-funkwhale_database_host_ansible: localhost
+# the DB host as per your ansible inventory. No delegation is used if left empty
+funkwhale_database_host_ansible:
 # the DB FQDN or IP for funkwhale connector configuration (ex: pg01.local)
 funkwhale_database_host_app: localhost
 funkwhale_database_port: 5432