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/Fsck.hs

@@ -60,7 +60,7 @@ runFsckForm new activity = case activity of
 	ScheduledSelfFsck s d -> go s d =<< liftAnnex getUUID
 	ScheduledRemoteFsck ru s d -> go s d ru
   where
-  	go (Schedule r t) d ru = do
+	go (Schedule r t) d ru = do
 		u <- liftAnnex getUUID
 		repolist <- liftAssistant (getrepolist ru)
 		runFormPostNoToken $ \msg -> do