Check audio/video track when rtc stream updated

[xiaozhihong]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2418 (da6663b) into 4.0release (df20fe6) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@              Coverage Diff               @@
##           4.0release    #2418      +/-   ##
==============================================
- Coverage       42.89%   42.89%   -0.01%     
==============================================
  Files             101      101              
  Lines           35803    35805       +2     
==============================================
  Hits            15359    15359              
- Misses          20444    20446       +2     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_rtc_conn.cpp | 9.39% <0.00%> (-0.02%) | ⬇️ |

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Translated to English while maintaining the markdown structure:

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