Remove inadvertent copyright violation in largeobject regression test.

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

Commit: d2783bee3045d6190dcff0ccf985c4e60a660f99
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-06-12T20:51:02Z
Releases: 9.5.0
Remove inadvertent copyright violation in largeobject regression test.

Robert Frost is no longer with us, but his copyrights still are, so
let's stop using "Stopping by Woods on a Snowy Evening" as test data
before somebody decides to sue us.  Wordsworth is more safely dead.

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