[xmonad] Move EWMH support initialization to a startupHook

[Justin Bogner]

This patch will break existing configs.

EwhmDesktops.setSupported sets some X atoms to constants. This should
rightfully be done once, in a startup hook, rather than repeatedly in
the log hook. This complicates the user configs a bit (though they can
just use Config.Desktop) but fixes problems like setWMName having to be
called in the log hook if ewmh is being used.

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