don't shown non-working file browser opening UI on android

Assistant/WebApp/Page.hs

@@ -5,7 +5,7 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
-{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
+{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes, CPP #-}
 
 module Assistant.WebApp.Page where
 
@@ -73,5 +73,12 @@ customPage' with_longpolling navbaritem content = do
   where
 	navdetails i = (navBarName i, navBarRoute i, Just i == navbaritem)
 
+hasFileBrowser :: Bool
+#ifdef ANDROID_SPLICES
+hasFileBrowser = False
+#else
+hasFileBrowser = True
+#endif
+
 controlMenu :: Widget
 controlMenu = $(widgetFile "controlmenu")