core: use setFileState inside retryUpload (#1759)
core: use setFileState inside retryUpload (#1759)

Makes it a bit easier to follow. It also logs a warning now when you do
`.retryUpload(SomeNonsenseFileID)` instead of silently adding an invalid
object to the state.
transloadit/uppy,transloadit/uppy,transloadit/uppy,transloadit/uppy