use enyo.dom.transform for panels animation

Use the cross-platform enyo.dom.transform instead of setting -webkit-transform
explicitly.

Issue: BHV-15490
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
Merge pull request #1721 from enyojs/BHV-15490-ryanjduffy

Fixes BHV-15490

Reviewed-By: Krishna Rangarajan (krishna.rangarajan@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)