GitLab

The default xterm doesn't provide us with extra fun colors, so update
the default to allow that.  This keeps us in sync w/hterm too.

Bug: 800049
Test: compiled & ran it
Change-Id: I648ec77ab5adc8542d2673848f666e5e8568db8b
Reviewed-on: https://chromium-review.googlesource.com/905264Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556736}