fix: deprecated postfix's 'smtpd_enforce_tls'

the parameter smtpd_enforce_tls was deprecated

see:

https://www.postfix.org/DEPRECATION_README.html

your service might be producing a warning if you
check it with `journalctl -feu postfix`

"postfix[PID]: /usr/sbin/postconf: warning:
/etc/postfix/master.cf:
support for parameter "smtpd_enforce_tls"
will be deprecated"

delete the line manually like done in this commit

emailwiz.sh

@@ -195,7 +195,6 @@ submission inet n       -       y       -       -       smtpd
   -o syslog_name=postfix/submission
   -o smtpd_tls_security_level=encrypt
   -o smtpd_tls_auth_only=yes
-  -o smtpd_enforce_tls=yes
   -o smtpd_client_restrictions=permit_sasl_authenticated,reject
   -o smtpd_sender_restrictions=reject_sender_login_mismatch
   -o smtpd_sender_login_maps=pcre:/etc/postfix/login_maps.pcre