VPN-6700: fix color

[mcleinman]

Description

I introduced this bug right here, by replacing color.overlayBackground = '#4D000000'; with color.overlayBackground = addTransparency(color.black, 0.0);. Of course, 4D is 30%, not 0%.

I went through and audited every other use of 0.0 transparency, to make sure I didn't have any other copy/paste errors. I found just one other spot that used 0.0 but the wrong color, and updated it as part of this PR. (Not all #00xxxxx colors are identical. While they look identical on screen, in transitions or with opacity changes they may look different. Changing all addTransparency(color.[anything], 0.0) to color.transparency will cause UI bugs.)

I also snuck two other things in here - a fix for a color name that needed to be updated, and a default colorScheme that suppresses some log warnings.

This color was used beneath overlays and above the help drawers. As expected, this PR fixes both spots (before photos are in the Jira ticket):

Reference

VPN-6700

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed