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.

Assistant/WebApp/Configurators/Delete.hs

@@ -36,7 +36,7 @@ notCurrentRepo uuid a = do
 		then redirect DeleteCurrentRepositoryR
 		else go =<< liftAnnex (Remote.remoteFromUUID uuid)
   where
-  	go Nothing = error "Unknown UUID"
+	go Nothing = error "Unknown UUID"
 	go (Just _) = a
 
 handleXMPPRemoval :: UUID -> Handler Html -> Handler Html