Updated firefly container name

ansible/roles/firefly3/templates/docker-compose.yml

@@ -9,7 +9,7 @@ networks:
 services:
   app:
     image: fireflyiii/core:latest
-    container_name: firefly3
+    container_name: firefly_iii_core
     restart: unless-stopped
     volumes:
       - "{{ data_dir }}/firefly3/upload:/var/www/html/storage/upload"