Fix EZP-21477: URL wildcards with leading slash are not matched

At /content/urlwildcards, when the user creates an URL wildcard alias starting with a slash, it will not get matched.

While at it, I also added a `/** @var eZModule $Module */` at the top of the file to satisfy IDEs and fixed a possible E_NOTICE for a possibly undefined `$limitValues` variable and a missing index. PHPStorm code inspection rules :).

https://jira.ez.no/browse/EZP-21477

Cheers
:octocat: Jérôme