Update expected output for dummy_index_am

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: bd29cc1992df9a1b786ca36c05e8f590d3795d10
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-09-25T19:17:19Z
Releases: 13.0
Update expected output for dummy_index_am

Forgot to add the file in the previous commit.

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