Fix testChangeDefaultColumnTest.

I split testMigrateProfileId into two tests: one testing the migration
and one testing changing the default column test.

Since testChangeDefaultColumnTest does not migrate any profile ids, the
correct answer is indeed 1 and not 6. Next time I will be sure to run the
tests first :).

Change-Id: I7557e198072ed134c8b42d6187afcb93d388c5a1