macos gui: mark unused fields in widgets

gui/src/macos/preferences/views/widgets.rs

@@ -205,7 +205,7 @@ pub struct PickerView<T>
 where
     T: ToString,
 {
-    pub view: View,
+    pub _view: View,
     pub select: Select,
     pub title: Label,
     _p: PhantomData<T>,
@@ -243,7 +243,7 @@ where
         ]);
 
         Self {
-            view,
+            _view: view,
             select,
             title,
             _p: PhantomData,