white space fixes on kAdPlayer.js
No functionality change, only re-factor cleanup to avoid deep nesting

* tested on iPhone/iPad, android desktop Chrome & Firefox & Safari
merge with 2.19-21-Sep
#FEC-1931 #comment fix for conflict + Disable seek for VAST in iPhone #time 3h
fix for open 'if' scope
fix - replacing intervalID to seekIntervalID
#FEC-1931 #comment replacing the implementation location from KAdPlayer to Kads
replacing bind to AdSupport_StartAdPlayback with onAdOpen since onAdOpen is call for every ad but the first is called once for all ads
#FEC-1931-AllowSeekWithNativeControls #comment setting seekIntervalID to null
#FEC-1931-AllowSeekWithNativeControls #comment cheking if interval is already exist
Merge pull request #942 from kaltura/FEC-1931-AllowSeekWithNativeControls

Fec 1931 allow seek with native controls