Add missing (COSTS OFF) to EXPLAIN added in previous commit.

Andres Freund <andres@anarazel.de>

Commit: c4944a93eb526f3799a36f30d46d6e765108b2b4
Author: Andres Freund <andres@anarazel.de>
Date: 2019-07-25T21:51:57Z
Releases: 12.0
Add missing (COSTS OFF) to EXPLAIN added in previous commit.

Backpatch: 12-, like the previous commit

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