Remove an undefined variable

tasks/main.yml

@@ -20,14 +20,14 @@
         hostname: '{{ epas_docker_attachments_node }}'
         labels:
           epas_storage: 'attachments'
-        labels_state: '{{ docker_label_state_mode }}'
+        labels_state: 'merge'
 
     - name: Add the label that will be used as a constraint for the postgresql DB
       docker_node:
         hostname: '{{ epas_docker_db_node }}'
         labels:
           epas_pg_data: 'epas_db'
-        labels_state: '{{ docker_label_state_mode }}'
+        labels_state: 'merge'
         when: epas_dockerized_db
 
     - name: Install the docker compose file