Hob: some color style changes to make HobTabBar more close to visual design

Hob: some color style changes to make HobTabBar more close to visual design

The change includes:
 - remove the colors which are not used
 - change the background of indicators to deep red
 - change the color style of the texts on HobTabBar, i.e., the tab text and the indicator background are gray when the tab is the current tab; the tab text is white and the indicator background is deep red when the tab is not the current tab.

(Bitbake rev: 95acecbf50cee906dca4abd5ce758701e5761668)

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>