Remove unused table, rename table

data/conf/postfix/sql/mysql_virtual_mailbox_maps.cf

@@ -2,4 +2,4 @@ user = mailcow
 password = mysafepasswd
 hosts = mysql
 dbname = mailcow
-query           = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'
+query = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'

data/conf/postfix/sql/mysql_virtual_relay_domain_maps.cf

@@ -0,0 +1,5 @@
+user = mailcow
+password = mysafepasswd
+hosts = mysql
+dbname = mailcow
+query = SELECT domain FROM domain WHERE domain='%s' AND backupmx = '1' AND active = '1'