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.

Checks.hs

@@ -35,7 +35,7 @@ noDaemonRunning :: Command -> Command
 noDaemonRunning = addCheck $ whenM (isJust <$> daemonpid) $
 	error "You cannot run this command while git-annex watch or git-annex assistant is running."
   where
-  	daemonpid = liftIO . checkDaemon =<< fromRepo gitAnnexPidFile
+	daemonpid = liftIO . checkDaemon =<< fromRepo gitAnnexPidFile
 
 dontCheck :: CommandCheck -> Command -> Command
 dontCheck check cmd = mutateCheck cmd $ \c -> filter (/= check) c