Drawer the activator down caret not showing in the light-theme, drawer n...

Drawer the activator down caret not showing in the light-theme, drawer nub height 5px less than spec, update to white activator bar color when open, refactor code Enyo-DCO-1.1-Signed-off-by: Brooke Peterson <brooke.peterson@lge.com>

### Issues:
1. In light theme, the caret on drawer nub not showing
2. The nub height is not the same as the visual spec (too low)
3. Drawer open state the activator bar should be white instead of current grey from the visual spec.

### Causes:
The color was forgot to be defined probably when we switching from image to icon font. In dark theme, color was inherited from the `.moon` class which is `#a6a6a6`, it showed on a dark grey background. However in light theme, since the `.moon` color is `#4b4b4` same as the activator bar background color so it was not showing. The height too shallow was caused by not probably position the nub. The white activator bar color was not implemented correctly.

### Fixes:
Define color in `.moon-drawers-activator:after` class, also reposition the nub.

### Notes:
I also refactor the code to simplified DOM, also removed two unnecessary files, please see the note on the Jira ticket.