Fix typo in database tests
Fix typo in database tests

The clause asserted in the database is foo(one,two) and foo(a,b)
doesn't unify with that.  The old test only worked as long as the
database did no indexing at all.

samuell/golog,vzaramel/golog,vzaramel/golog,mndrix/golog,samuell/golog,mndrix/golog,bransorem/golog,bransorem/golog