#CT-7653: Remove scrollbar from iFrames that extend past lenght of page

@pheuter I want to get your feedback on my changes before we merge. See comments.
@pheuter, below, I wasn't sure why the height is arbitrarily set to 100px less than the windowHeight. I commented this out. Why was this here and can I comment this out now that we aren't going to be scrolling? Are there issues involved with modals?