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.

Remote.hs

@@ -101,7 +101,7 @@ byName (Just n) = either error Just <$> byName' n
 byNameWithUUID :: Maybe RemoteName -> Annex (Maybe Remote)
 byNameWithUUID = checkuuid <=< byName
   where
-  	checkuuid Nothing = return Nothing
+	checkuuid Nothing = return Nothing
 	checkuuid (Just r)
 		| uuid r == NoUUID =
 			if remoteAnnexIgnore (gitconfig r)