assistant2: Highlight crease on selection (#24358)

Give the inline file crease inside of `assistant2`'s editor a
selection background when there is a selection over it

Release Notes:

- N/A

---------

Co-authored-by: Piotr <piotr@zed.dev>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/editor/src/editor.rs

@@ -1142,7 +1142,7 @@ impl Editor {
         let editor = cx.entity().downgrade();
         let fold_placeholder = FoldPlaceholder {
             constrain_width: true,
-            render: Arc::new(move |fold_id, fold_range, _, cx| {
+            render: Arc::new(move |fold_id, fold_range, cx| {
                 let editor = editor.clone();
                 div()
                     .id(fold_id)