Remove generic handle in Image

For now, we will simply assume images will be loaded from a given path.

wgpu/src/renderer/image.rs

@@ -1,16 +1,12 @@
 use crate::{Primitive, Renderer};
 use iced_native::{image, Image, Layout, MouseCursor, Node, Style};
 
-impl image::Renderer<&str> for Renderer {
-    fn node(&self, _image: &Image<&str>) -> Node {
+impl image::Renderer for Renderer {
+    fn node(&self, _image: &Image) -> Node {
         Node::new(Style::default())
     }
 
-    fn draw(
-        &mut self,
-        _image: &Image<&str>,
-        _layout: Layout<'_>,
-    ) -> Self::Output {
+    fn draw(&mut self, _image: &Image, _layout: Layout<'_>) -> Self::Output {
         (Primitive::None, MouseCursor::OutOfBounds)
     }
 }