[10.x] test: fix expectation in test-bootstrap-modules
Ref: https://github.com/nodejs/node/pull/25027#issuecomment-447482946
CI: https://ci.nodejs.org/job/node-test-pull-request/19661/ https://ci.nodejs.org/job/node-test-pull-request/19700/
Lint rerun: https://ci.nodejs.org/job/node-test-linter/24472/
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines