quatrix: fix Content-Range header

This change does not actually affect uploads. Just to be right according to definition of Content-Range in
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Range#range-end

backend/quatrix/quatrix.go

@@ -1201,7 +1201,8 @@ func (o *Object) upload(ctx context.Context, uploadKey string, chunk io.Reader,
 		Method:        "POST",
 		RootURL:       fmt.Sprintf(uploadURL, o.fs.opt.Host) + uploadKey,
 		Body:          chunk,
-		ContentRange: fmt.Sprintf("bytes %d-%d/%d", offset, offset+chunkSize, fullSize),
+		ContentLength: &chunkSize,
+		ContentRange:  fmt.Sprintf("bytes %d-%d/%d", offset, offset+chunkSize-1, fullSize),
 		Options:       options,
 	}