[Dovecot] Remove additional hash scheme and let Dovecot decide the hash by prefix

data/conf/dovecot/dovecot.conf

@@ -43,11 +43,7 @@ passdb {
   pass = yes
 }
 passdb {
-  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-ssha256-passdb.conf
-  driver = sql
-}
-passdb {
-  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-additional-passdb.conf
+  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-passdb.conf
   driver = sql
 }
 # Set doveadm_password=your-secret-password in data/conf/dovecot/extra.conf (create if missing)