Fix TODB tests when providing initial DB dump to test with

[rawlinp]

What does this PR (Pull Request) do?

Fixes a new issue w/ the TODB tests when providing an initial database dump file. This test feature was accidentally broken in the conversion to postgres 13.2: #5630

Which Traffic Control components are affected by this PR?

• Traffic Ops DB tests

What is the best way to verify this PR?

NOTE: the TODB postgres version that produces the TO DB dump should be 13.2. If it's 9.6, the test will fail because you can't restore a 9.6 DB dump into a 13.2 DB. If you use CIAB to get the TO dbdump, it should work, since CIAB now uses 13.2.

cd traffic_ops_db/test/docker
# get a DB dump from TO via /api/3.0/dbdump, put the dump file in ./initdb.d/
docker-compose build
docker-compose up --exit-code-from trafficops-db-admin

If this is a bug fix, what versions of Traffic Control are affected?

• master

The following criteria are ALL met by this PR

• This PR includes tests
• test fix, no docs necessary
• unreleased bug, no changelog necessary
• This PR includes any and all required license headers
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[zrhoffman]

Approving as db tests pass now using a 13.2 dump from CDN in a Box, but it would be nice to be able to test a PG 9.6 dump in PG 13.2.