Fix duplicate key bug

Author: MGatner

src/Database/Migrations/20190407221924_create_table_settings.php

@@ -21,7 +21,6 @@ public function up()
 		$this->forge->addField('id');
 		$this->forge->addField($fields);
 
-		$this->forge->addUniqueKey('name');
 		$this->forge->addKey('created_at');
 
 		$this->forge->createTable('settings');