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/file_finder/src/file_finder.rs

@@ -93,7 +93,7 @@ impl FileFinder {
 
     fn new(delegate: FileFinderDelegate, cx: &mut ViewContext<Self>) -> Self {
         Self {
-            picker: cx.new_view(|cx| Picker::new(delegate, cx)),
+            picker: cx.new_view(|cx| Picker::uniform_list(delegate, cx)),
         }
     }
 }