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/Git.hs

@@ -305,7 +305,7 @@ inAnnex rmt key
 	| Git.repoIsUrl r = checkremote
 	| otherwise = checklocal
   where
-  	r = repo rmt
+	r = repo rmt
 	checkhttp = do
 		showChecking r
 		ifM (Url.withUrlOptions $ \uo -> anyM (\u -> Url.checkBoth u (keySize key) uo) (keyUrls rmt key))