Restore the tables.sql to its virgin state.

app/Database/tables.sql

@@ -75,9 +75,6 @@ INSERT INTO `ospos_app_config` (`key`, `value`) VALUES
 	('payment_options_order', 'cashdebitcredit'),
 	('protocol', 'mail'),
 	('mailpath', '/usr/sbin/sendmail'),
-	('smtp_host', ''),
-	('smtp_user', ''),
-	('smtp_pass', ''),
 	('smtp_port', '465'),
 	('smtp_timeout', '5'),
 	('smtp_crypto', 'ssl'),