Fix ArchiveTestCase on PostgreSQL

test_archive_deleted_rows_no_id_column() filters DnsDomain instances by
value of 'deleted' column (which is of type Boolean). Integer value 1
is passed instead of boolean value True. This works great on MySQL and
SQLite, but fails on PostgreSQL which is more strict when checking data
types of passed values.

Blueprint: db-api-tests-on-all-backends

Change-Id: I06c8ba323cff02804d0aef3bf56892c111f67226
Merge "Fix ArchiveTestCase on PostgreSQL"