remove unnecessary haskell extensions

Assistant/Threads/WebApp.hs

@@ -5,7 +5,8 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes, CPP #-}
+{-# LANGUAGE TemplateHaskell, MultiParamTypeClasses #-}
+{-# LANGUAGE CPP #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
 module Assistant.Threads.WebApp where