api, metrics: fix RTC lowercase in webRTCSession and webRTCSource

[aler9]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.68%. Comparing base (28970b3) to head (1b39b28).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/staticsources/webrtc/source.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4076      +/-   ##
==========================================
+ Coverage   55.66%   55.68%   +0.02%     
==========================================
  Files         193      193              
  Lines       19792    19792              
==========================================
+ Hits        11018    11022       +4     
+ Misses       7930     7927       -3     
+ Partials      844      843       -1     

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