Simplify Iris app initialization and task updates

src/desktop/render.rs

@@ -1,4 +1,3 @@
-use crate::task::RequestRedraw;
 use iris_core::{FrameParts, LinearRgba, Ui, UiRenderNode, util::Vec2};
 use pollster::FutureExt;
 use std::sync::Arc;
@@ -8,12 +7,6 @@ use winit::{dpi::PhysicalSize, window::Window};
 
 pub const CLEAR_COLOR: LinearRgba = LinearRgba::BLACK;
 
-impl RequestRedraw for Window {
-    fn request_redraw(&self) {
-        Window::request_redraw(self);
-    }
-}
-
 pub struct UiRenderer {
     window: Arc<Window>,
     surface: Surface<'static>,