[329] fix another lint error!

test/unit/registrar/channel.spec.js

@@ -9,7 +9,6 @@ import phoneNumberRepository from '../../../app/db/repositories/phoneNumber'
 import inviteRepository from '../../../app/db/repositories/invite'
 import signal from '../../../app/signal'
 import { sdMessageOf } from '../../../app/signal/constants'
-import messenger from '../../../app/dispatcher/messenger'
 import { genPhoneNumber } from '../../support/factories/phoneNumber'
 import { deepChannelAttrs } from '../../support/factories/channel'
 import { statuses } from '../../../app/util'