Enable /devices endpoint for generic workers

roles/matrix-synapse/vars/workers.yml

@@ -43,6 +43,7 @@ matrix_synapse_workers_generic_worker_endpoints:
   - ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/members$
   - ^/_matrix/client/(api/v1|r0|unstable)/rooms/.*/state$
   - ^/_matrix/client/(api/v1|r0|unstable)/account/3pid$
+  - ^/_matrix/client/(api/v1|r0|unstable)/devices$
   - ^/_matrix/client/(api/v1|r0|unstable)/keys/query$
   - ^/_matrix/client/(api/v1|r0|unstable)/keys/changes$
   - ^/_matrix/client/versions$