Fix typo (matrix_telegram_facebook_postgres_hostname -> matrix_mautrix_telegram_postgres_hostname)

Related to 9bf8ce878e.

group_vars/matrix_servers

@@ -978,7 +978,7 @@ matrix_postgres_additional_databases: |
       'name': matrix_mautrix_telegram_postgres_db_name,
       'username': matrix_mautrix_telegram_postgres_username,
       'password': matrix_mautrix_telegram_postgres_password,
-    }] if (matrix_mautrix_telegram_enabled and matrix_mautrix_telegram_database_engine == 'postgres' and matrix_telegram_facebook_postgres_hostname == 'matrix-postgres') else [])
+    }] if (matrix_mautrix_telegram_enabled and matrix_mautrix_telegram_database_engine == 'postgres' and matrix_mautrix_telegram_postgres_hostname == 'matrix-postgres') else [])
     + ([{
       'name': matrix_mautrix_whatsapp_postgres_db_name,
       'username': matrix_mautrix_whatsapp_postgres_username,