Remove failing collation case from object_address regression test.

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

Commit: 3e2275355954cabf89ba044fe8557ef347bf3fb1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-12-23T21:55:51Z
Releases: 9.5.0
Remove failing collation case from object_address regression test.

Per buildfarm, this test case does not yield consistent results.
I don't think it's useful enough to figure out a workaround, either.

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