DB-759 fix tokudb::alter_card to copy ALL of the cardinality data not just the low byte

storage/tokudb/tests/card_test_key_info.cc

@@ -107,7 +107,6 @@ typedef unsigned long long ulonglong;
 typedef unsigned long ulong;
 #endif
 #include <tokudb_card.h>
-#define MAX_KEY 256
 
 static void test_no_keys() {
     TABLE_SHARE s = { 0, 0, 0, NULL };

storage/tokudb/tests/fake_mysql.h

@@ -112,3 +112,4 @@ uint get_key_parts(KEY_INFO *key_info) {
     assert(key_info);
     return key_info->key_parts;
 }
+#define MAX_KEY (1U << 30)