Fix the create_index regression test for Danish collation.

Kevin Grittner <kgrittn@postgresql.org>

Commit: de31442b8b2818e211be3e334f778746705c5ab2
Author: Kevin Grittner <kgrittn@postgresql.org>
Date: 2013-06-19T15:37:57Z
Releases: 9.2.5
Fix the create_index regression test for Danish collation.

In Danish collations, there are letter combinations which sort
higher than 'Z'.  A test for values > 'WA' was picking up rows
where the value started with 'AA', causing the test to fail.

Backpatch to 9.2, where the failing test was added.

Per report from Svenne Krap and analysis by Jeff Janes

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