[Xmonad] Patch: Operations.hs: deobfuscate Tall's doLayout and make use of fromMaybe

[Eric Mertens]

I wasn't intending to make a flood of small patches, I just noticed
these things when looking to see how messy it would be for the default
layouts to honor applyHints by default.
-- 
Eric Mertens                                   Phone: 503.626.6616, x155
Galois                                                 Fax: 503.214.8120
12725 SW Millikan Way Ste 290                      http://www.galois.com
Beaverton, OR 97005-1691                             emertens at galois.com
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