chore(clippy): mime_app, operation, mounter

Fixes Clippy lints for:
* src/mounter/
* src/operation/
* src/mime_app.rs
* src/mouse_area.rs (I missed two of them last time)

src/operation/mod.rs

@@ -993,7 +993,7 @@ mod tests {
                 paths: paths_clone,
                 to: to_clone,
             }
-            .perform(&sync::Mutex::new(tx).into(), Controller::new())
+            .perform(&sync::Mutex::new(tx).into(), Controller::default())
             .await
         });