test: remove flag for test-addon-uv-handle-leak
test-addon-uv-handle-leak only requires worker_threads for the subprocess which it explicitly calls with --experimental-worker. The main test itself does not need it. Remove Flags: comment and move loading of worker_threads into subprocess-only logic.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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