Remove inadvertent copyright violation in largeobject regression test.

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

Commit: 7e00e09872f194c3dc30faca6aff7c2a32b608f6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-06-12T20:51:05Z
Releases: 9.4.0
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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