gpui: Rename rounded_md to rounded_sm (#26228)

This PR renames the `rounded_md` style method to `rounded_sm`.

Follow up to https://github.com/zed-industries/zed/pull/26221, which
freed up the `rounded_sm` name.

Release Notes:

- N/A

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

@@ -211,13 +211,13 @@ 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.outlined, |this| this.rounded_sm())
                             .when(self.selected, |this| {
                                 this.bg(cx.theme().colors().ghost_element_selected)
                             })
                     })
             })
-            .when(self.rounded, |this| this.rounded_md())
+            .when(self.rounded, |this| this.rounded_sm())
             .child(
                 h_flex()
                     .id("inner_list_item")
@@ -260,7 +260,7 @@ impl RenderOnce for ListItem {
                     .when(self.outlined, |this| {
                         this.border_1()
                             .border_color(cx.theme().colors().border)
-                            .rounded_md()
+                            .rounded_sm()
                             .overflow_hidden()
                     })
                     .when_some(self.on_secondary_mouse_down, |this, on_mouse_down| {
@@ -271,7 +271,7 @@ impl RenderOnce for ListItem {
                     .when_some(self.tooltip, |this, tooltip| this.tooltip(tooltip))
                     .map(|this| {
                         if self.inset {
-                            this.rounded_md()
+                            this.rounded_sm()
                         } else {
                             // When an item is not inset draw the indent spacing inside of the item
                             this.ml(self.indent_level as f32 * self.indent_step_size)