indent with tabs not spaces

Found these with:
git grep "^  " $(find -type  f -name \*.hs) |grep -v ':  where'

Unfortunately there is some inline hamlet that cannot use tabs for
indentation.

Also, Assistant/WebApp/Bootstrap3.hs is a copy of a module and so I'm
leaving it as-is.

Logs/SingleValue.hs

@@ -60,6 +60,6 @@ getLog = newestValue <$$> readLog
 
 setLog :: (SingleValueSerializable v) => FilePath -> v -> Annex ()
 setLog f v = do
-        now <- liftIO getPOSIXTime
-        let ent = LogEntry now v
+	now <- liftIO getPOSIXTime
+	let ent = LogEntry now v
 	Annex.Branch.change f $ \_old -> showLog (S.singleton ent)