VID-1993 Fixed broken Selenium tests

* Need to wait for elements to appear before testing them
* Was not swapping video before trying to undo a swap
VID-1993 Updates in response to CR comments

* Formatting
* Removing 'this'
* Using scrollAndClick()
VID-1993 Update selector from code review
Merge pull request #295 from Wikia/VID-1993

VID-1993 Fixed broken Selenium tests