recent projects: cleanup ui (#7528)

As the ui for the file finder was recently changed in #7364, I think it
makes sense to also update the ui of the recent projects overlay.

Before:

![image](https://github.com/zed-industries/zed/assets/53836821/8a0f5bef-9b37-40f3-a974-9dfd7833cc71)

After:

![image](https://github.com/zed-industries/zed/assets/53836821/7e9f934a-1ac3-4716-b7b6-67a7435f3bde)


Release Notes:

- Improved UI of recent project overlay

crates/outline/src/outline.rs

@@ -86,7 +86,7 @@ impl OutlineView {
         cx: &mut ViewContext<Self>,
     ) -> OutlineView {
         let delegate = OutlineViewDelegate::new(cx.view().downgrade(), outline, editor, cx);
-        let picker = cx.new_view(|cx| Picker::new(delegate, cx).max_height(vh(0.75, cx)));
+        let picker = cx.new_view(|cx| Picker::uniform_list(delegate, cx).max_height(vh(0.75, cx)));
         OutlineView { picker }
     }
 }