Changed env var from json to str

frontend/src/app/admin/util/validateEnv.ts

@@ -4,7 +4,7 @@
  */
 
 import { cleanEnv } from "envalid";
 import { json, str } from "envalid/dist/validators";
 
 /**
  * NextJS only allows the frontend to access environment variables if they start with
@@ -19,7 +19,7 @@
   },
   {
     NEXT_PUBLIC_BACKEND_URL: str(), // URL of our backend
-    NEXT_PUBLIC_FIREBASE_SETTINGS: json(), // Firebase settings for frontend, stored as a JSON string
+    NEXT_PUBLIC_FIREBASE_SETTINGS: str(), // Firebase settings for frontend
     NEXT_PUBLIC_PAYPAL_CLIENT_SECRET: str(),
     NEXT_PUBLIC_PAYPAL_CLIENT_ID: str(),
   },