Update package.json simple build with comma

Author: Karlo-Emilo

package.json

@@ -6,7 +6,7 @@
   "type": "module",
   "license": "MIT",
   "scripts": {
-    "build": "node prepEnv.js simple && vite build"
+    "build": "node prepEnv.js simple && vite build",
     "dev": "node prepEnv.js unbranded && vite",
     "devML": "node prepEnv.js branded && vite",
     "devSimple": "node prepEnv.js simple && vite",