textproc/augeas: Fix rsyslog lense

This integrate the PR863 that fixes parsing of rsyslogd.conf
files with "if xxx then {}".

PR:	287586
Approved by:	0mp (mentor)
Approved by:	maintainer timeout
Sponsored by:	Klara, Inc.
Obtained from:	https://github.com/hercules-team/augeas/pull/863
Differential Revision:	https://reviews.freebsd.org/D50873