Update replace.sql

[rongfengliang]

resolves: #187

{% set is_replaceable = existing_relation.type == target_relation_type and existing_relation.can_be_replaced %}

maybe

{% set is_replaceable = existing_relation.type == target_relation.type and existing_relation.can_be_replaced %}

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[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[mikealfare]

Thanks for the PR @rongfengliang! We'll need to test this against concrete adapters to make sure that the functionality we're effectively turning on here works. In the meantime, if you could update the changelog body, then this will be ready to merge pending those tests.