Switch postgres/postgres-backup Ansible role sources and adjust variable names (devture_postgres_ -> postgres_)

roles/custom/matrix-bridge-appservice-irc/tasks/migrate_nedb_to_postgres.yml

@@ -2,8 +2,8 @@
 
 - name: Fail if Postgres not enabled
   ansible.builtin.fail:
-    msg: "Postgres via the com.devture.ansible.role.postgres role is not enabled (`devture_postgres_enabled`). Cannot migrate."
-  when: "not devture_postgres_enabled | bool"
+    msg: "Postgres via the com.devture.ansible.role.postgres role is not enabled (`postgres_enabled`). Cannot migrate."
+  when: "not postgres_enabled | bool"
 
 # Defaults
 
@@ -16,7 +16,7 @@
 
 - name: Ensure Postgres is started
   ansible.builtin.service:
-    name: "{{ devture_postgres_identifier }}"
+    name: "{{ postgres_identifier }}"
     state: started
     daemon_reload: true
   register: postgres_service_start_result