Rename and clear bad code

src/import.rs

@@ -62,7 +62,7 @@ pub enum ImportMessage {
 }
 
 impl NavigatedPage<ImportMessage> for ImportState {
-    fn navigate(&self, message: &ImportMessage) -> Option<Page> {
+    fn navigate(&mut self, message: &ImportMessage) -> Option<Page> {
         if self.progress.is_some() {
             return None;
         }