zu: Fix reference lint errors

Author: XuShaohua

crates/zu/src/button/mod.rs

@@ -155,7 +155,7 @@ fn create_icon(
         size::icon_class(button_size),
         custom_classes,
     );
-    icon.as_ref().map_or_else(
+    icon.map_or_else(
         || html! {},
         |icon| {
             html! {
@@ -220,9 +220,9 @@ pub fn button(props: &Props) -> Html {
             on_touch_end={&props.on_touch_end}
             on_touch_move={&props.on_touch_move}
             on_touch_start={&props.on_touch_start}>
-            {create_icon(true, &props.start_icon, props.size, props.start_icon_classes.clone())}
+            {create_icon(true, props.start_icon.as_ref(), props.size, props.start_icon_classes.clone())}
             {for props.children.iter()}
-            {create_icon(false, &props.end_icon, props.size, props.end_icon_classes.clone())}
+            {create_icon(false, props.end_icon.as_ref(), props.size, props.end_icon_classes.clone())}
         </ButtonBase>
     }
 }

crates/zu/src/container/mod.rs

@@ -43,7 +43,7 @@ pub struct Props {
 pub fn container(props: &Props) -> Html {
     let root_cls = classes!(
         "ZuContainer-root",
-        size::css_class(&props.max_width),
+        size::css_class(props.max_width.as_ref()),
         if props.disable_gutters {
             "ZuContainer-disableGutters"
         } else {

crates/zu/src/loading_button/mod.rs

@@ -187,7 +187,7 @@ pub fn loading_button(props: &Props) -> Html {
 
     let indicator = if props.loading {
         create_indicator(
-            &props.loading_indicator,
+            props.loading_indicator.as_ref(),
             props.loading_position,
             props.size,
             props.variant,