Fix haskell-hoogle to work with buffer local var #1167
                
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Read the
haskell-hoogle-commandvariable before switching to the help window which removes the buffer localhaskell-hoogle-commandfrom the scope.In other words: This is a tiny change, I just extracted the command text into a variable defined outside the context of the new buffer so that the right buffer local
haskell-hoogle-commandis used.