ui: Apply elevation outside SettingsContainer (#15346)

This PR changes the `SettingsContainer` component such that the
elevation styles are applied by the parent instead of
`SettingsContainer` itself.

This means that components using `SettingsContainer` can be embedded in
different contexts, like the settings UI or a popover containing the
settings.

Release Notes:

- N/A

crates/ui/src/components/settings_container.rs

@@ -23,11 +23,7 @@ impl ParentElement for SettingsContainer {
 }
 
 impl RenderOnce for SettingsContainer {
-    fn render(self, cx: &mut WindowContext) -> impl IntoElement {
-        v_flex()
-            .elevation_2(cx)
-            .px_2()
-            .gap_1()
-            .children(self.children)
+    fn render(self, _cx: &mut WindowContext) -> impl IntoElement {
+        v_flex().px_2().gap_1().children(self.children)
     }
 }