Fix bug when two divs are scrolled at once

On a page that has two iscroll divs, if one pulls both up from the bottom using both fingers, then lets go, one will snap back into position and the other will stay where it was. With this change, both will snap back into position.

It's simply removing one line of code. I figure this line was probably intentional, but I don't know why it's there. However, this seems to work for me. Please let me know if you see any problems with this.