Fix hook run header text for white backgrounds

Users with white terminal backgrounds wouldn't see this text because we
were forcing it to be white rather than just bold.

Change-Id: I21979d260393c6a2a395bb5b4014d19b68d50c14
Reviewed-on: http://gerrit.causes.com/41215
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>