Fixes ENYO-664

## Issue
Refactor ExpandableIntegerPicker to remove `noneText`

## Fix
Remove `noneText`, Sync the default values between ExpandableIntegerPicker and IntegerPicker, refine bindings, eliminate unnecessary computed properties

Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)