fix: revert hot_standby change

[shemau]

Description

Issues #508 introduced a regression in wal_level. Revert the wal_level part of that PR.

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[shemau]

/run pipeline

[shemau]

hot_standby was causing a hang in provisioning, so the expectation is the PR pipeline will fail

[ocofaigh]

Super seeded by https://github.com/terraform-ibm-modules/terraform-ibm-icd-postgresql/pull/514