[xmonad] darcs patch: Small bugfix to X.L.Fullscreen

[Audun Skaugen]

When using xmonad on another machine, the XMonad.Layout.Fullscreen
module stopped refreshing the layout when a window entered fullscreen.
This patch makes the layout modifiers return a Just instead of a
Nothing on the FullscreenChanged message, fixing the bug. I do wonder,
however, why the modifiers worked fine before.

The patch also fixes some funny whitespace.

-- 
Audun Skaugen
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