Fixed a test that's been passing for the wrong reason - in fixture, the
total # of active users happens to be equal to the # of users in the
default org (regardless of is_active value), so test was comparing size
of an irrelevant set of users with the # of watchers added to a new Decision
... and they just happened to match. When Sarah fixed the code so that
only active members of an organization get added as watchers on a new
Decision, the test started failing. Have fixed the test so that the expected
number of watchers is calculated correctly and now the test is passing for the right
reasons!