[Etherpad] Fix volume name for week instance for match old name

pica-etherpad/docker-compose.yml

@@ -3,8 +3,8 @@ version : "2.4"
 volumes:
   etherpad-db:
     name: etherpad-db
-  etherpad-week-db:
-    name: etherpad-week-db
+  weekpad-db:
+    name: weekpad-db
 
 networks:
   standard:
@@ -100,7 +100,7 @@ services:
     cpus: "0.40"
     pids_limit: 1024
     volumes:
-      - etherpad-week-db:/var/lib/mysql
+      - weekpad-db:/var/lib/mysql
     env_file: ./secrets/etherpad-week-db.secrets
     restart: unless-stopped
     # See https://stackoverflow.com/questions/41134785/how-to-solve-mysql-warning-innodb-page-cleaner-1000ms-intended-loop-took-xxx