ENYO-720: Popup in video slider has wrong height

Issue: 
Slider popup canvas and label are using different unit of height. This make round canvas and label had different height.

Fix:
Remove use of enyo.dom.unit on popupLabel, popup and popup offset height value.

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com