fix some mixed space+tab indentation

This fixes all instances of " \t" in the code base. Most common case
seems to be after a "where" line; probably vim copied the two space layout
of that line.

Done as a background task while listening to episode 2 of the Type Theory
podcast.

CmdLine.hs

@@ -58,7 +58,7 @@ dispatch fuzzyok allargs allcmds commonoptions fields header getgitrepo = do
 			shutdown $ cmdnocommit cmd
 	go _flags params (Left e) = do
 		when fuzzy $
-	 		autocorrect =<< Git.Config.global
+			autocorrect =<< Git.Config.global
 		maybe (throw e) (\a -> a params) (cmdnorepo cmd)
 	err msg = msg ++ "\n\n" ++ usage header allcmds
 	cmd = Prelude.head cmds