tweak draft state text color for improved contrast

test plan:
 - green text for published items should be #33802a
   for the instructor views of pages, modules, assignments, and
   quizzes (RGB: 51, 128, 42)

fixes CNVS-11229

Change-Id: Ifeee06f0ad4897889e68566faeda916f660126fc
Reviewed-on: https://gerrit.instructure.com/30976
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bracken Mosbacker <bracken@instructure.com>
QA-Review: Matt Fairbourn <mfairbourn@instructure.com>
Product-Review: Dana Morley <dana@instructure.com>