ui: Round hover styles for ListItems with outlined set (#22120)

This PR makes `ListItem`s with `outlined` set use the same rounding for
their hover state to ensure that the hover background doesn't bleed
outside of the outline.

Release Notes:

- N/A

crates/ui/src/components/list/list_item.rs

@@ -202,6 +202,7 @@ impl RenderOnce for ListItem {
                     .when(self.selectable, |this| {
                         this.hover(|style| style.bg(cx.theme().colors().ghost_element_hover))
                             .active(|style| style.bg(cx.theme().colors().ghost_element_active))
+                            .when(self.outlined, |this| this.rounded_md())
                             .when(self.selected, |this| {
                                 this.bg(cx.theme().colors().ghost_element_selected)
                             })