message: receipt-manager: remove unused import
diff: @@ -7,7 +7,6 @@ import {
  SimpleAllocation,
  } from '@statechannels/wallet-core'
  import { alice as me } from '@statechannels/server-wallet/lib/src/wallet/__test__/fixtures/signing-wallets'
  -import { getChannelId } from '@statechannels/nitro-protocol'
  import {
  AppData,
  StateType,
  