DB/RBAC: added missing rbac permission entry for modify currency command

sql/updates/auth/4.3.4/2018_03_28_00_auth.sql

@@ -0,0 +1,5 @@
+DELETE FROM `rbac_permissions` WHERE `id`= 775;
+INSERT INTO `rbac_permissions` (`id`, `name`) VALUES (775, 'Command: modify currency');
+DELETE FROM `rbac_linked_permissions` WHERE `linkedId`= 775;
+INSERT INTO `rbac_linked_permissions` (`id`, `linkedId`) VALUES
+(196, 775);