[dev] Surf patch to disable link hover when focus is lost

Surf changes the window title to reflect the URL of the link under the
pointer. This is good, as it means you can use xmobar or dzen or some
other program to inspect links, rather than having a dedicated pane.

It is also bad, because if you switch away from surf while hovering over
a link, the surf window will have a poor title, and will be harder to
find if you use window titles for navigation.

The attached patch fixes this by reverting the hover whenever the surf
window loses focus.

-- 
\  Troels
/\ Henriksen