refresh IntegerPicker scroller and repeater when shown

Issue: BHV-14905
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
BHV-14905: Allow for step size change to propagate clamped value.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>