stream: use arrow fns for 'this' in readable
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
Using arrow functions for this in readable stream.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
make -j4 test (UNIX), or vcbuild test (Windows) passesUsing arrow functions for this in readable stream.