chore(clippy): mouse_area, controller & more

Fixes lints for:
* src/operation/controller.rs
* src/mouse_area.rs
* src/mounter/mod.rs

src/tab.rs

@@ -475,7 +475,7 @@ pub fn item_from_entry(
     };
 
     let dir_size = if metadata.is_dir() {
-        DirSize::Calculating(Controller::new())
+        DirSize::Calculating(Controller::default())
     } else {
         DirSize::NotDirectory
     };