test: remove destructuring from test-inspector-contexts

As I'm working with this test, I'm finding the destructuring of assert
and vm to make this test harder to read/understand. So I'm taking the
liberty of removing them.

PR-URL: https://github.com/nodejs/node/pull/30649


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>