BHV-10455: DataGridList: Initial Selected checkboxItem does not retain s...

...election upon Popup List Collapse/Expand
### Issue:
Initial selected checkboxItem(16) does not retain selection as another checkboxItem(2) does upon popup collapse/expand
### Fix:
As implemented in DataListSample, two-way bind "on" property with "value"/"checked" property

Enyo-DCO-1.1-Signed-off-by: Krishna Rangarajan <krishna.rangarajan@lge.com>