src: apply clang-tidy rule modernize-use-equals-default
Also from: https://ci.nodejs.org/job/node-clang-tidy/7/console. Rule def: https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-equals-default.html.
cc @refack
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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