message: fix(image-writer): Remove use of _.isError
  `_.isError()` returns `true` for anything that has a `name` and `message`
  property, causing the check here to always keep the plain object as error.
  Change-Type: patch
diff: @@ -118,7 +118,7 @@ exports.performWrite = (image, drives, onProgress) => {
  return new Bluebird((resolve, reject) => {
  ipc.server.on('error', (error) => {
  terminateServer()
  - const errorObject = _.isError(error) ? error : errors.fromJSON(error)
  + const errorObject = errors.fromJSON(error)
  reject(errorObject)
  })
  