LP1991103: incorporate feedback from review, address failing test
* Remove icon from tab
* Don't use warning styling
* Add spacing between the tab title and its number
* Make the test amenable to any number of spaces between the tab
title and number; it doesn't really matter how many there are,
but there needs to be at least one.
Signed-off-by: Jane Sandberg <sandbergja@gmail.com> Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>