fix(layout-sider): support layout-sider trigger slot (#5317)

* fix(layout-sider): support layout-sider trigger slot

* fix: sider trigger support slot

Co-authored-by: huangchengjie <[email protected]>
Co-authored-by: tangjinzhou <[email protected]>

Author: KaygNas

components/layout/Sider.tsx

@@ -147,7 +147,7 @@ export default defineComponent({
         width,
         reverseArrow,
         zeroWidthTriggerStyle,
-        trigger,
+        trigger = slots.trigger?.(),
         collapsible,
         theme,
       } = props;