Hide Scroll bar

[ben-fletcher]

Summary
When there are many departures on one page the scroll bar appears
Current
When you many departures on the main departures screen the scroll bar appears to allow you to scroll down
Expected
The scroll bar should be hidden but the user should still be able to scroll up and down
How to Test
Go to the main board and load over 12 departures. You should no longer be able to see the scroll bar but you should be able to scroll down and up the page as normal.