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.

Command/TransferKeys.hs

@@ -57,7 +57,7 @@ runRequests readh writeh a = do
 		fileEncoding writeh
 	go =<< readrequests
   where
-  	go (d:rn:k:f:rest) = do
+	go (d:rn:k:f:rest) = do
 		case (deserialize d, deserialize rn, deserialize k, deserialize f) of
 			(Just direction, Just remotename, Just key, Just file) -> do
 				mremote <- Remote.byName' remotename