[#238] Remove notice since it won't show up on React page anyway

Author: noahko96

Diff for: app/controllers/adventures_controller.rb

@@ -142,7 +142,7 @@ def duplicate
     duplicated_adventure.title = "Copy of #{@adventure.title}"
     duplicated_adventure.save
 
-    redirect_to [:edit, duplicated_adventure], notice: "Adventure was successfully copied."
+    redirect_to [:edit, duplicated_adventure]
   end
 
   private