logrotate: drop "create"

In Debian, even with rsyslog installed, there's no "syslog" user, and
rsyslog runs as root.
It is expected that rsyslog will create the file itself.
There are no particular automated use of log files, so it doesn't matter
for files to have "bluecherry" group and be readable for that group.

debian/bluecherry.logrotate

@@ -6,7 +6,6 @@
 	notifempty
 	delaycompress
 	compress
-	create 640 syslog bluecherry
 	postrotate
 		reload rsyslog >/dev/null 2>&1 || true
 	endscript