Remove redundant context for event handler tests
Remove redundant context for event handler tests

Just like the new tests for suspending and archiving services, we
can use the 'client' fixture instead of a context, which avoids
the extra nesting. Note that the first event handler doesn't use
its first argument, which I've tried to indicate with a string.

alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin,alphagov/notifications-admin