Drop separate Sidekiq vol, it should use the main one

compose.yml

@@ -85,7 +85,7 @@ services:
     depends_on:
       - discourse
     volumes:
-      - 'sidekiq_data:/bitnami/discourse'
+      - 'discourse_data:/bitnami/discourse'
     command: /opt/bitnami/scripts/discourse-sidekiq/run.sh
     secrets:
       - db_password
@@ -115,7 +115,6 @@ volumes:
   postgresql_data:
   redis_data:
   discourse_data:
-  sidekiq_data:
 
 networks:
   proxy: