style: remove unnecessary function whitespace

Remove the unnecessary whitespace between the function name or the
'function' keyword and the opening parenthesis.

src/layouts/LeftSidebarLayout.vue

@@ -29,7 +29,7 @@ const props = defineProps({
 
 const expanded = ref(props.expanded);
 
-const toggleSidebar = function toggleSidebar () {
+const toggleSidebar = function toggleSidebar() {
     expanded.value = !expanded.value;
 };
 </script>