test: test-crypto-prime.js doesn't need internals

PR-URL: #56675
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Mohammed Keyvanzadeh <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: nektro

test/parallel/test-crypto-prime.js

@@ -1,4 +1,3 @@
-// Flags: --expose-internals
 'use strict';
 
 const common = require('../common');