Update NavBar styles to match new redlines

color-definitions.less was updated. @colorMid and @colorMediumMid are
currently the same and that's okay. We want to keep them both in case we
want to change them to different values in the future.

Also updated some NavBar tests:
- VerticalKeyboarding: Had to be updated due to changes in the heights of
  the viewport and commands
- DataEdits, ArrowKeysPressed: Made these tests faster (they were quite
  slow in Firefox)