Update chatMessageReceiving.js #13907
Description
Resolves #13905
If the unread message count is more than 50 messages, I displayed it as 50+. FYI.
Checklist
- I fully tested it as developer / designer and created unit / integration tests
- I documented it (or no need to document or I will create a separate documentation issue)
- I worked with the design team to get their idea for UI/UX design (or no need to design for this PR)
- I've assigned reviewer, related labels and set a milestone for this PR