docker: enable flux in influxdb docker block

devenv/docker/blocks/influxdb/influxdb.conf

@@ -69,6 +69,7 @@ reporting-disabled = false
 
   unix-socket-enabled = false # enable http service over unix domain socket
   # bind-socket = "/var/run/influxdb.sock"
+  flux-enabled = true
 
 [subscriber]
   enabled = true