Don't specify "index_file" parameter during category/category item link building, when mod-rewrite is enabled

In-Portal have shortcut links near each item in catalog in Admin Console. These links allow to quickly view item detail page on Front-End.

Since links are built from Admin Console into Front-End theme, then we add "index_file" => "index.php" parameter to convert /admin/index.php url part just into /index.php.
However this parameter is absolutely ignored when mod-rewrite is enabled resulting it's being present as-is in final url (e.g. ....&index_file=index.php).

Usually it's not a big problem, since once you've enabled mod-rewrite on website you most likely won't disable it, but since you can't really change behavior behind PageBrowseLink tags (used to build these shortcut links), then these tags should be self-aware and always build nice url themselves.