chore: revert back environment variable prefixes to VITE_

packages/hoppscotch-selfhost-web/prod_run.mjs

@@ -3,7 +3,7 @@ import { execSync } from "child_process"
 import fs from "fs"
 
 const envFileContent = Object.entries(process.env)
-  .filter(([env]) => env.startsWith("APP_"))
+  .filter(([env]) => env.startsWith("VITE_"))
   .map(
     ([env, val]) =>
       `${env}=${val.startsWith('"') && val.endsWith('"') ? val : `"${val}"`}`