paginator: Use derive Default instead

src/widgets/paginator.rs

@@ -9,7 +9,7 @@ mod imp {
     use super::*;
     use std::cell::{Cell, RefCell};
 
-    #[derive(Debug, gtk::CompositeTemplate)]
+    #[derive(Default, Debug, gtk::CompositeTemplate)]
     #[template(resource = "/org/gnome/Tour/ui/paginator.ui")]
     pub struct PaginatorWidget {
         #[template_child]
@@ -25,20 +25,6 @@ mod imp {
         pub(super) going_backward: Cell<bool>,
     }
 
-    impl Default for PaginatorWidget {
-        fn default() -> Self {
-            Self {
-                carousel: TemplateChild::default(),
-                start_btn: TemplateChild::default(),
-                next_btn: TemplateChild::default(),
-                previous_btn: TemplateChild::default(),
-                pages: RefCell::default(),
-                current_page: Cell::new(0),
-                going_backward: Cell::new(false),
-            }
-        }
-    }
-
     #[glib::object_subclass]
     impl ObjectSubclass for PaginatorWidget {
         const NAME: &'static str = "PaginatorWidget";