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/Helper/Chunked.hs

@@ -123,7 +123,7 @@ storeChunks u chunkconfig k f p storer checker =
 	
 		loop bytesprocessed (chunk, bs) chunkkeys
 			| L.null chunk && numchunks > 0 = do
- 				-- Once all chunks are successfully
+				-- Once all chunks are successfully
 				-- stored, update the chunk log.
 				chunksStored u k (FixedSizeChunks chunksize) numchunks
 				return True
@@ -138,7 +138,7 @@ storeChunks u chunkconfig k f p storer checker =
 					)
 		  where
 			numchunks = numChunks chunkkeys
- 			{- The MeterUpdate that is passed to the action
+			{- The MeterUpdate that is passed to the action
 			 - storing a chunk is offset, so that it reflects
 			 - the total bytes that have already been stored
 			 - in previous chunks. -}
@@ -290,7 +290,7 @@ retrieveChunks retriever u chunkconfig encryptor basek dest basep sink
 		hSeek h AbsoluteSeek startpoint
 		return h
 
- 	{- Progress meter updating is a bit tricky: If the Retriever
+	{- Progress meter updating is a bit tricky: If the Retriever
 	 - populates a file, it is responsible for updating progress
 	 - as the file is being retrieved. 
 	 -