BHV-4060: Only reflow when necessary (first opening, picker property change).
BHV-4060: Only reflow when necessary (first opening, picker property change).

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

mcanthony/moonstone,enyojs/moonstone,mcanthony/moonstone,mcanthony/moonstone