refactor backendBuildDate

src/app/lib/prefetch-queries.ts

@@ -29,10 +29,7 @@ export async function prefetchLayoutQueries(queryClient: QueryClient) {
 			queryFn: async () => {
 				try {
 					const response = await getBuildData();
-					if (response.buildTimeBack) {
-						return response.buildTimeBack;
-					}
-					return null;
+					return response.buildTimeBack ?? null;
 				} catch (error) {
 					return null;
 				}