search: Simplify search options handling (#36233)

Release Notes:

- N/A

crates/zed/src/zed/quick_action_bar.rs

@@ -140,7 +140,7 @@ impl Render for QuickActionBar {
         let search_button = editor.is_singleton(cx).then(|| {
             QuickActionBarButton::new(
                 "toggle buffer search",
-                IconName::MagnifyingGlass,
+                search::SEARCH_ICON,
                 !self.buffer_search_bar.read(cx).is_dismissed(),
                 Box::new(buffer_search::Deploy::find()),
                 focus_handle.clone(),