Fixes BHV-13602

## Issue
Setting `display` style in code was conflicting with setting `showing: false` on list action controls

## Fix
Move display style into CSS files so it can be overridden correctly by `showing`

Enyo-DCO-1.1-Signed-off-by: Ryan Duffy <ryan.duffy@lge.com>
Hi @ryanjduffy 
Can I ask what does this fix mean?
Cause we still have `stackedChanged` method so I just curious what are `stacked` and `this.stacked`