Revert copyright script changes to binary *.key files

Bruce Momjian <bruce@momjian.us>

Commit: 344c26915136fa54c4a1bf54074ba15090b32721
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-01-14T16:28:07Z
Releases: 13.0
Revert copyright script changes to binary *.key files

This reverts part of commit 7559d8ebfa.  The copyright script has
already been updated to skip *.key files.

Reported-by: Alvaro Herrera

Discussion: https://postgr.es/m/20200102184059.GA25435@alvherre.pgsql

Backpatch-through: master

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