Fix uploadrate value of 'original-title' attribute

The unit of `data.bitrate` is bit, but the argument unit of
`humanFileSize` function is byte, so it should be divided by 8.

Signed-off-by: Yaojin Qian <i@ume.ink>

apps/files/js/file-upload.js

@@ -1027,7 +1027,7 @@ OC.Uploader.prototype = _.extend({
 						t('files', '{loadedSize} of {totalSize} ({bitrate})' , {
 							loadedSize: humanFileSize(data.loaded),
 							totalSize: humanFileSize(data.total),
-							bitrate: humanFileSize(data.bitrate) + '/s'
+							bitrate: humanFileSize(data.bitrate / 8) + '/s'
 						})
 					);
 					$('#uploadprogressbar').progressbar('value', progress);