testsuite/a11y/about: Fix exp. output per e56a9e6c

Daniel Bolesrequested to merge
dboles/issue1949 into gtk-3-24

Commit e56a9e6c fixing Issue #686 (closed) changed what happens here, for whatever reason, and there's apparently no notion of 'correctness' to worry about, so just update the expected output to match and pass CI.

Close #1949 (comment 531709)

Edited by Daniel Boles

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