[feature/twig] Put $SCRIPTS below overall_footer_after, use includejs for core

Moved below overall_footer_after so events can add JS files in that event.

PHPBB3-11598

phpBB/styles/prosilver/template/overall_footer.html

@@ -56,8 +56,10 @@
 <!-- INCLUDEJS forum_fn.js -->
 <!-- INCLUDEJS {T_ASSETS_PATH}/javascript/core.js -->
 <!-- INCLUDEJS ajax.js -->
-{$SCRIPTS}
 
 <!-- EVENT overall_footer_after -->
+
+{$SCRIPTS}
+
 </body>
 </html>