BHV-13297: Integer picker width changes slightly with every change in number

### Issue:
 integer picker width changes slightly with every change in number
### Fix:
create minWidth property, which sets the min-width css property of the picker, and then set minWidth to an appropriate value in the sample, given the range.

Enyo-DCO-1.1-Signed-off-by: Krishna Rangarajan <krishna.rangarajan@lge.com>