Fix collate.linux.utf8 expected output for recent error message change.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: e661c3dfd320487aaa1d6223e732e00c1b5c3cc2
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-10-16T20:07:40Z
Releases: 9.2.0
Fix collate.linux.utf8 expected output for recent error message change.

Noted by Jeff Davis.

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