test: remove extra process.exit()

[cjihrig]

I missed this during the review of #29816.

process.exit() has a tendency to hide test failures because it forces the process to exit. This test doesn't need the process.exit(), so this commit removes it.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/25898/

[ZYSzys]

So maybe we should remove those process.exit() too ?

node/test/parallel/test-http-localaddress.js

Lines 50 to 53 in 064e111

	res.on('end', () => {
	server.close();
	process.exit();
	});

node/test/parallel/test-https-localaddress.js

Lines 62 to 65 in 064e111

	res.on('end', function() {
	server.close();
	process.exit();
	});

[danbev]

Landed in 7682874.