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/Sync.hs

@@ -356,7 +356,7 @@ syncFile rs f k = do
 	handleDropsFrom locs' rs "unwanted" True k (Just f)
 		Nothing callCommandAction
   where
-  	wantget have = allM id 
+	wantget have = allM id 
 		[ pure (not $ null have)
 		, not <$> inAnnex k
 		, wantGet True (Just k) (Just f)