Fixes BHV-18232

## Issue
While I can't find the documentation to support this, it appears that adding a transform implicitly creates a new position context on which any descendants positioning is then based. The issue with moon.Scroller is that its transform isn't applied until the first scroll so the control is initially positioned based on the Scroller's bounds and then re-positioned based on the scroller client once the transform is applied. RTL is a red herring here; the issue can be reproduced in LTR if the absolutely positioned box uses right instead of left.

## Fix
Add relative positioning to the scroller client

Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)