Remove unneeded wrapping divs in ListItem left content (#3438)

This PR removes some unneeded wrapping `div`s around the left content in
`ListItem`s.

Release Notes:

- N/A

crates/ui2/src/components/stories/list_item.rs

@@ -2,7 +2,7 @@ use gpui::{Div, Render};
 use story::Story;
 
 use crate::prelude::*;
-use crate::ListItem;
+use crate::{Icon, ListItem};
 
 pub struct ListItemStory;
 
@@ -14,6 +14,20 @@ impl Render for ListItemStory {
             .child(Story::title_for::<ListItem>())
             .child(Story::label("Default"))
             .child(ListItem::new("hello_world").child("Hello, world!"))
+            .child(Story::label("With left icon"))
+            .child(
+                ListItem::new("with_left_icon")
+                    .child("Hello, world!")
+                    .left_icon(Icon::Bell),
+            )
+            .child(Story::label("With left avatar"))
+            .child(
+                ListItem::new("with_left_avatar")
+                    .child("Hello, world!")
+                    .left_avatar(SharedString::from(
+                        "https://avatars.githubusercontent.com/u/1714999?v=4",
+                    )),
+            )
             .child(Story::label("With `on_click`"))
             .child(
                 ListItem::new("with_on_click")