quiet a lint

obelisk/frontend/src/PlatformEvents.hs

@@ -10,7 +10,7 @@ data PlatformEvent = BackPressed deriving (Eq, Ord, Show)
 
 -- | Bundle up the different application-supplied handlers for different
 -- platform events.
-data PlatformEventCallbacks = PlatformEventCallbacks
+newtype PlatformEventCallbacks = PlatformEventCallbacks
     { onBackPressed :: IO ()
     }