[Finder] Fixed a path in a test.

Its probably better to be explicit rather than to rely on a path position in the array. Position has changed during a merge.

src/Symfony/Component/Finder/Tests/FinderTest.php

@@ -761,7 +761,7 @@ public function testMultipleLocationsWithSubDirectories()
     {
         $locations = array(
             __DIR__.'/Fixtures/one',
-            self::$files[8],
+            self::$tmpDir.DIRECTORY_SEPARATOR.'toto',
         );
 
         $finder = new Finder();