BHV-11025: Redundant event call in iconButton

### Issue
The onActivate event is called for every item creation in DataGridList Sample.

### Fix
Selectively call activeChanged on iconButton so that it can set active only when the item has initial active value on it.

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com