Fix test expectations

Signed-off-by: Michal Čihař <michal@cihar.com>

test/libraries/PMA_insert_edit_test.php

@@ -2526,7 +2526,7 @@ class PMA_InsertEditTest extends PHPUnit_Framework_TestCase
         );
 
         $this->assertEquals(
-            "'20''12'",
+            "'20\\'12'",
             $result
         );