PT-2400 - pt-table-checksum reports the error for warning code 4164

- Fixed typo
- Added test case

t/pt-table-checksum/samples/pt-2400.sql

@@ -0,0 +1,13 @@
+DROP DATABASE IF EXISTS `pt-2400`;
+CREATE DATABASE `pt-2400`;
+USE `pt-2400`;
+CREATE TABLE `apple` (
+  `id` int NOT NULL,
+  `name` varchar(255) NOT NULL,
+  PRIMARY KEY (`id`,`name`)
+) ENGINE=InnoDB;
+
+INSERT INTO `apple` VALUES
+  (1, 'Granny Smith'),
+  (2, 'Red Delicious'),
+  (3, 'Golden Apple');