Update vite.config.ts for Vercel template (#126)

to be consistent with the default template

Author: ruidi-huang

vercel/vite.config.ts

@@ -3,6 +3,6 @@ import tailwindcss from "@tailwindcss/vite";
 import { defineConfig } from "vite";
 import tsconfigPaths from "vite-tsconfig-paths";
 
-export default defineConfig(() => ({
+export default defineConfig({
   plugins: [tailwindcss(), reactRouter(), tsconfigPaths()],
-}));
+});