Remove unnecessary option to supply password

Password is not necessary when using a trusted
connection (localhost).  Tested by moving mail in and out of Junk
folder while monitoring `/var/log/rspamd/rspamd.log`.

roles/mailserver/files/etc_dovecot_conf.d_90-antispam.conf

@@ -5,5 +5,5 @@ plugin {
     antispam_mail_sendmail = /usr/bin/rspamc
     antispam_mail_spam     = learn_spam
     antispam_mail_notspam  = learn_ham
-    antispam_mail_sendmail_args = -h;localhost:11334;-P;q1
+    antispam_mail_sendmail_args = -h;localhost:11334
 }