Make sure note.system is false if created by user

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/services/notes/create_service.rb

@@ -3,6 +3,7 @@ module Notes
     def execute
       note = project.notes.new(params[:note])
       note.author = current_user
+      note.system = false
       note.save
       note
     end