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.

RemoteDaemon/Transport/Ssh.hs

@@ -119,5 +119,5 @@ robustly backoff a = caught =<< catchDefaultIO ConnectionClosed a
 		| b2 > maxbackoff = maxbackoff
 		| otherwise = b2
 	  where
-	  	b2 = backoff * 2
+		b2 = backoff * 2
 		maxbackoff = 3600 -- one hour