gdash: fix code deploy colors for white background

White on white doesn't work so well, and grey on white doesn't work
either. Switch scaps to black and sync-common-file to dashed gold
instead to match the continuous gold for sync-common-all.

It remains to be seen whether gold is a good color for displaying on a
white background.

Change-Id: I3833f390598342dd3d8f82878f25227395ffdb86