Rename and clear bad code

src/selector.rs

@@ -36,7 +36,7 @@ pub enum SelectorMessage {
 }
 
 impl NavigatedPage<SelectorMessage> for SelectorState {
-    fn navigate(&self, message: &SelectorMessage) -> Option<Page> {
+    fn navigate(&mut self, message: &SelectorMessage) -> Option<Page> {
         if let SelectorMessage::Goto = message {
             return if self.is_writing {
                 let writing = WritingState::new(&self.set);