server: fix compatibility with rtspclientsink and query parameters (bluenviron/mediamtx#3295)

[aler9]

Fixes bluenviron/mediamtx#3295

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (2023bf1) to head (08b0e45).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
server_session.go	87.50%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #619      +/-   ##
==========================================
- Coverage   81.88%   81.86%   -0.02%     
==========================================
  Files         115      115              
  Lines       11625    11637      +12     
==========================================
+ Hits         9519     9527       +8     
- Misses       1703     1706       +3     
- Partials      403      404       +1     

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