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

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

Commit: 1004f4bb876d10857508a9ab65131f96e24a4658
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-10-16T20:07:44Z
Releases: 9.1.2
Fix collate.linux.utf8 expected output for recent error message change.

Noted by Jeff Davis.

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