Replace #p-lang-list with #p-lang .body ul

The #p-lang-list id was removed from core (I028880cfa),
and this broke the compact links beta feature.
This commit replaces it with a different selector.

Change-Id: I154919a54b032dd481fe080204a2a16819d85140

resources/js/ext.uls.compactlinks.js

@@ -317,6 +317,6 @@
 	};
 
 	$( document ).ready( function () {
-		$( '#p-lang-list' ).compactInterlanguageList();
+		$( '#p-lang .body ul' ).compactInterlanguageList();
 	} );
 }( jQuery, mediaWiki ) );