test: correct assertion argument order in test/sequential/test-inspector.js
This makes assertions in sequential/test-inspector.js
conform to follow the argument order of asserted then actual, and adds more explicit messages to describe assertion failures.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines