make sure we test normalization against normalized title

make sure we test normalization against normalized title

This patch fix ApiQueryTest::testTitlesGetNormalized() when $wgMetaNamespace
would contains space / underscore.

Example:
-8<-------------8<------------8<------------------8<----------8<------
1) ApiQueryTest::testTitlesGetNormalized
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
     'from' => 'Project:articleA'
-    'to' => 'My_Project:ArticleA'
+    'to' => 'My Project:ArticleA'
 )
-8<-------------8<------------8<------------------8<----------8<------

This patch use Title class logic to forge a normalized title instead of
manually creating it by appending two strings.

Final fix to bug 33663 (comment 21):
https://bugzilla.wikimedia.org/show_bug.cgi?id=33663#c21