XWIKI-9787: Jump to a page using Ctrl-G doesn't work
- Using the shortcut script's default 'keydown' keyboard event since it seems to be triggered before any other browser's listeners (feeds in IE, find next in FF and Chrome, etc) and works consistently across browsers and versions (IE8+, FF, Chrome, Safari, Opera, etc.)

(cherry picked from commit 374964d30301777800cc90a18f3ab6a06d08138b)