Chore: Remove extra parentheses from return type (#19598)

client/lib/createSidebarItems.ts

@@ -4,11 +4,11 @@ type SidebarItem = {
 	i18nLabel: string;
 };
 
-export const createSidebarItems = (initialItems: SidebarItem[] = []): ({
+export const createSidebarItems = (initialItems: SidebarItem[] = []): {
 	registerSidebarItem: (item: SidebarItem) => void;
 	unregisterSidebarItem: (i18nLabel: SidebarItem['i18nLabel']) => void;
 	itemsSubscription: Subscription<SidebarItem[]>;
-}) => {
+} => {
 	const items = initialItems;
 	let updateCb: (() => void) = () => undefined;