Remove more extraneous parentheses in date/time functions.

Bruce Momjian <bruce@momjian.us>

Commit: 09ff9dbe2b8074d2109489813c0354a6331369d6
Author: Bruce Momjian <bruce@momjian.us>
Date: 2005-05-24T02:09:45Z
Releases: 8.1.0
Remove more extraneous parentheses in date/time functions.

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