fix: populate myreaction on replies for streams.

What does this MR do?

fixes #340 (closed).

i've seen that upstream has a similar solution for boosts and quotes (just above my code) and so i've tried mimicking that. i've considered the discussions under the issues but frankly i don't think this changes too much to be misdirecting. : )

if anything, i can write a comment above each line.

Contribution Guidelines

By submitting this merge request, you agree to follow our Contribution Guidelines

• I agree to follow this project's Contribution Guidelines
• I have made sure to test this merge request