GF-52365: Move header transition property to small header

Actucally header itself does not need transition css property.
What is really need it is small header.
To prevent unexpected behavior in panel header, move this css property
to small header

Enyo-DCO-1.1-Signed-off-by: David Um <david.um@lge.com>
GF-52365: Remove small header transition (animation handled by StyleAnimator via collapseHeader() and expandHeader()).  Add resized call after smallHeaderChanged, to ensure fittable is sized correctly if changed at runtime.
DCO-1.1-Signed-Off-By: Kevin Schaaf <kevin.schaaf@lge.com>
Merge branch 'master' into GF-52365-davidum

Conflicts:
	css/Header.less
GF-52365: Add small header toggle.
DCO-1.1-Signed-Off-By: Kevin Schaaf <kevin.schaaf@lge.com>
Merge pull request #860 from enyojs/GF-52365-davidum

GF-52365: Move header transition property to small header