I found these things annoying as well. Luckily I still had the .tar of the old version of this theme, so i manually replaced all the old icons

@mesho123
This icon is placed in /usr/share/themes/harmattan-black/images/
and is called wmProgressIndicator.png
I attached the old one.

edit: Fun part is, the image is white, so itsnt visible on this background But its there allright