Allow plus icons in project nav to inherit color
What does this MR do and why?
The manually set color for plus icons in the project nav is not the same as the color of the parent, so it should simply inherit color.
References
Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.
- #499695 (closed)
- https://www.reddit.com/r/gitlab/comments/1h22a81/just_noticed_the_add_contributing_icon_is_a/
Screenshots or screen recordings
| Mode | Before | After |
|---|---|---|
| Light |  |
 |
| Dark |  |
 |
How to set up and validate locally
- Check out this branch
- Create a new blank project in the GDK
- On the project homepage, look at the "Add ..." links in the right nav link section. The
+icons will all have the same color as the link text.