matrix-synapse: enable device_lists writer in worker presets

roles/custom/matrix-synapse/defaults/main.yml

@@ -955,7 +955,7 @@ matrix_synapse_workers_presets:
     stream_writer_receipts_stream_workers_count: 1
     stream_writer_presence_stream_workers_count: 1
     stream_writer_push_rules_stream_workers_count: 0
-    stream_writer_device_lists_stream_workers_count: 0
+    stream_writer_device_lists_stream_workers_count: 1
   specialized-workers:
     room_workers_count: 1
     sync_workers_count: 1
@@ -975,7 +975,7 @@ matrix_synapse_workers_presets:
     stream_writer_receipts_stream_workers_count: 1
     stream_writer_presence_stream_workers_count: 1
     stream_writer_push_rules_stream_workers_count: 0
-    stream_writer_device_lists_stream_workers_count: 0
+    stream_writer_device_lists_stream_workers_count: 1
 
 # Controls whether the matrix-synapse container exposes the various worker ports
 # (see `port` and `metrics_port` in `matrix_synapse_workers_enabled_list`) outside of the container.