src: apply clang-tidy rule modernize-use-override
See https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html.
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
See https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-override.html.
make -j4 test (UNIX), or vcbuild test (Windows) passes