Make it work with Debian 12: spamassassin -> spamd

This commits checks for /etc/default/spamassassin. If it exists, it's
passed through sed to modify the CRON variable as usual, and
spamassassin.service is enabled and restarted.

If /etc/default/spamassassin does not exist, but /etc/default/spamd
exists, we modify /etc/default/spamd instead, and restart and enable
spamd.service.

This has to be done because Debian 12 introduced this breaking change:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1020859

Apologies for my previous commit which introduced a new "README" file
specifically for my fork of the repository. I've modified my patch to
remove it, please accept this version of the patch instead.

Signed-off-by: Andrew Yu <andrew@andrewyu.org>

emailwiz.sh

@@ -318,9 +318,23 @@ enabled = true
 enabled = true" > /etc/fail2ban/jail.d/emailwiz.local
 
 # Enable SpamAssassin update cronjob.
-sed -i "s|^CRON=0|CRON=1|" /etc/default/spamassassin
-
-for x in spamassassin opendkim dovecot postfix fail2ban; do
+if [ -f /etc/default/spamassassin ]
+then
+	sed -i "s|^CRON=0|CRON=1|" /etc/default/spamassassin
+	printf "Restarting spamassassin..."
+	service spamassassin restart && printf " ...done\\n"
+	systemctl enable spamassassin
+elif [ -f /etc/default/spamd ]
+then
+	sed -i "s|^CRON=0|CRON=1|" /etc/default/spamd
+	printf "Restarting spamd..."
+	service spamd restart && printf " ...done\\n"
+	systemctl enable spamd
+else
+	printf "!!! Neither /etc/default/spamassassin or /etc/default/spamd exists, this is unexpected and needs to be investigated"
+fi
+
+for x in opendkim dovecot postfix fail2ban; do
 	printf "Restarting %s..." "$x"
 	service "$x" restart && printf " ...done\\n"
 	systemctl enable "$x"