Fix mouse clicks on remote-open-folder UI (#19851)

Also change Zed's standard style to use
`.track_focus(&self.focus_handle(cx))`, instead of
`.track_focus(&self.focus_handle)`, to catch these kinds of errors more
easily in the future.

Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>

crates/picker/src/head.rs

@@ -52,8 +52,8 @@ impl EmptyHead {
 }
 
 impl Render for EmptyHead {
-    fn render(&mut self, _: &mut ViewContext<Self>) -> impl IntoElement {
-        div().track_focus(&self.focus_handle)
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        div().track_focus(&self.focus_handle(cx))
     }
 }