use getClientBoundingRect for marquee distance calculation

Issue: ENYO-696
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
refactor _marquee_calcDistance

Issue: ENYO-696
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
Merge pull request #1864 from enyojs/ENYO-696-ryanjduffy

Fixes ENYO-696

Reviewed-By: Art Dahm (art.dahm@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)