fix(uploader): Correctly (re)set progress on upload

[susnux]

On upload event we should also update the uploaded bytes for chunked uploads.
Moreover we need to reset the uploaded bytes when a retry occures as the progress bar is otherwise showing the wrong ETA.

Basically:

• on progress event: Update the uploaded bytes to 90% of it (we reserve 10% until the request finished)
• on response we add that 10% reserved bytes (so the server responded with OK -> mark the chunk / upload as 100% done)
• on retry we reset the uploaded bytes for that chunk