Fixed Server error overlay not responsive

[refael]

iPhone5

 

[Mike]

There was an intentional aspect here: elements with overflow: auto can behave annoyingly when scrolling on touch devices (actually when the overlay is absolutely positioned, but most commonly on mobiles). As such, we actually remove overlay scrolling in this case. However, there are a couple cases where the overflow is actually added for horizontal overflow so we need to maintain that. As such, I've added a new class to those cases (there are a number) to ensure they still trigger horizontal overflow if needed.