lib: remove usc-2 encoding
Fixes: https://github.com/nodejs/node/issues/21963
CI: https://ci.nodejs.org/job/node-test-pull-request/16000/
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fixes: https://github.com/nodejs/node/issues/21963
CI: https://ci.nodejs.org/job/node-test-pull-request/16000/
make -j4 test (UNIX), or vcbuild test (Windows) passes