src: remove unused `Worker::child_port_` member
This fixes a compiler warning introduced in 92259395.
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
This fixes a compiler warning introduced in 92259395.
make -j4 test
(UNIX), or vcbuild test
(Windows) passes