[TIMOB-11181] Fix gradientLayer animations

Test is in [TIMOB-11181](https://jira.appcelerator.org/browse/TIMOB-11181)

Use test case in comments
Animates gradientLayer using CABasicAnimation when doing reposition

Regress against 
[TIMOB-11951](https://jira.appcelerator.org/browse/TIMOB-11951)
[TC-1264](https://jira.appcelerator.org/browse/TC-1264)