Implemented linker - class for admin_tickets.php (templates automatic replace only)

Signed-off-by: Florian Aders (EleRas) <eleras@froxlor.org>

templates/Classic/admin/ticket/tickets_new.tpl

@@ -1,5 +1,5 @@
 $header
-	<form method="post" action="$filename">
+	<form method="post" action="{$linker->getLink(array('section' => 'tickets'))}">
 		<input type="hidden" name="s" value="$s" />
 		<input type="hidden" name="page" value="$page" />
 		<input type="hidden" name="action" value="$action" />
@@ -13,4 +13,4 @@ $header
 	</form>
 	<br />
 	<br />
-$footer
+$footer