Restore co-author hiding (#26257)

Release Notes:

- N/A

crates/git_ui/src/git_panel.rs

@@ -2243,9 +2243,9 @@ impl GitPanel {
 
     pub(crate) fn render_co_authors(&self, cx: &Context<Self>) -> Option<AnyElement> {
         let potential_co_authors = self.potential_co_authors(cx);
-        // if potential_co_authors.is_empty() {
-        //     None
-        // } else {
+        if potential_co_authors.is_empty() {
+            None
+        } else {
             Some(
                 IconButton::new("co-authors", IconName::Person)
                     .shape(ui::IconButtonShape::Square)
@@ -2273,7 +2273,7 @@ impl GitPanel {
                     }))
                     .into_any_element(),
             )
-        // }
+        }
     }
 
     pub fn configure_commit_button(&self, cx: &mut Context<Self>) -> (bool, &'static str) {