Changes the testStandalone test so that it do not longer tests all
colors whether they are disposed after fColors.dispose(), because it is
the correct behaviour that colors should not be disposed when they are
still in use.

Change-Id: I8d0b25617c8716ed3a9549ac7994605d855ff5cb
Signed-off-by: Ralf M Petter <ralf.petter@gmail.com>