Remove more references to 'model' in GPUI APIs (#23693)

Release Notes:

- N/A

crates/language_tools/src/syntax_tree_view.rs

@@ -303,7 +303,7 @@ impl Render for SyntaxTreeView {
         {
             let layer = layer.clone();
             rendered = rendered.child(uniform_list(
-                cx.model().clone(),
+                cx.entity().clone(),
                 "SyntaxTreeView",
                 layer.node().descendant_count(),
                 move |this, range, _, cx| {
@@ -451,7 +451,7 @@ impl SyntaxTreeToolbarItemView {
         let active_layer = buffer_state.active_layer.clone()?;
         let active_buffer = buffer_state.buffer.read(cx).snapshot();
 
-        let view = cx.model().clone();
+        let view = cx.entity().clone();
         Some(
             PopoverMenu::new("Syntax Tree")
                 .trigger(Self::render_header(&active_layer))