[ticket/11795] Get rid of pagination JS variables

Move pagination variables to data attributes
Replace A_BASE_URL with BASE_URL and use TWIG to escape it

PHPBB3-11795

phpBB/styles/prosilver/template/overall_header.html

@@ -26,10 +26,6 @@
 
 <script type="text/javascript">
 // <![CDATA[
-	var jump_page = '{LA_JUMP_PAGE}{L_COLON}';
-	var on_page = '{ON_PAGE}';
-	var per_page = '{PER_PAGE}';
-	var base_url = '{A_BASE_URL}';
 
 	<!-- IF S_USER_PM_POPUP and S_NEW_PM -->
 		var url = '{UA_POPUP_PM}';