Fix styling of project search tabs (#3633)

This PR fixes the styling of the project search tabs.

We now have spacing between the icon and the tab label, as well as use
the correct color for the icon based on whether the tab is active or
not.

Release Notes:

- N/A

crates/search2/src/project_search.rs

@@ -417,7 +417,12 @@ impl Item for ProjectSearchView {
             .filter(|query| !query.is_empty())
             .unwrap_or_else(|| "Project search".into());
         h_stack()
-            .child(IconElement::new(Icon::MagnifyingGlass))
+            .gap_2()
+            .child(IconElement::new(Icon::MagnifyingGlass).color(if selected {
+                Color::Default
+            } else {
+                Color::Muted
+            }))
             .child(Label::new(tab_name).color(if selected {
                 Color::Default
             } else {