fixing issue with second screen of VET after VideoHandlers refactor

This addresses an issue where json embed code wasn't being encoded before being sent to a VET template.  In the past, only JWPlayer returned a json object instead of HTML.  Since this particular code is only used for non-premium videos (i.e. youtube) it was always expecting a string.  Since we're now always sending json I've removed the string check and just json encode all embed code.  

Thanks @RodriGomez for catching this bug. 

The VET.js changes were just cleanup because it bugged me that we were using "o" as a variable for response data.