remove duplicated key

roles/matrix-synapse/defaults/main.yml

@@ -264,9 +264,6 @@ matrix_synapse_manhole_enabled: false
 matrix_synapse_workers_enabled: false
 
 # List of workers to spawn
-matrix_synapse_workers_enabled_list: []
-
-# Default list of workers to spawn
 matrix_synapse_workers_enabled_list:
   - { worker: synchrotron, port: 18082 }
   - { worker: synchrotron, port: 18083 }