test: remove message from strictEqual assertions
When an AssertionError happens, the value of headers['set-cookie'] is not reported. That information is useful for debugging. Hence removed the value passed as the message in deepStrictEqual assertions of test/parallel/test-http2-cookies.js
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
This first contribution is based on a suggestion from cc @trott