Avoid splitting C string literals with \-newline

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: c4dcd9144ba64946c9f9466748bdb2c51719c8a3
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-12-24T15:44:12Z
Releases: 13.0
Avoid splitting C string literals with \-newline

Using \ is unnecessary and ugly, so remove that.  While at it, stitch
the literals back into a single line: we've long discouraged splitting
error message literals even when they go past the 80 chars line limit,
to improve greppability.

Leave contrib/tablefunc alone.

Discussion: https://postgr.es/m/20191223195156.GA12271@alvherre.pgsql

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