[BUG] [App Loader - android.html] Progress bar on Bangle.js 2 not animating

The progres bar does not animate on the Bangle.js 2 screen when uploading apps from the android.html version of the app loader. The normal browser version works as expected. Tested on the dev app loader at https://espruino.github.io/BangleApps/ with and without android.html.

The actual uploading of apps works still and the browser window animates fine.

Tagging @gfwilliams and @RKBoss6