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.

Utility/CoProcess.hs

@@ -65,7 +65,7 @@ query ch send receive = do
 			restartable s (receive $ coProcessFrom s)
 				return
   where
-  	restartable s a cont
+	restartable s a cont
 		| coProcessNumRestarts (coProcessSpec s) > 0 =
 			maybe restart cont =<< catchMaybeIO a
 		| otherwise = cont =<< a
@@ -87,7 +87,7 @@ rawMode ch = do
 	raw $ coProcessTo s
 	return ch
   where
-  	raw h = do
+	raw h = do
 		fileEncoding h
 #ifdef mingw32_HOST_OS
 		hSetNewlineMode h noNewlineTranslation