rtsp: fix authentication when algorithm field is not supported (#3116)

[aler9]

Fixes #3116

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 52.68%. Comparing base (c0ad6e4) to head (1135709).

Files	Patch %	Lines
internal/auth/manager.go	50.00%	0 Missing and 2 partials ⚠️
internal/conf/rtsp_auth_methods.go	33.33%	2 Missing ⚠️
internal/conf/conf.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3314      +/-   ##
==========================================
- Coverage   52.68%   52.68%   -0.01%     
==========================================
  Files         194      194              
  Lines       20016    20015       -1     
==========================================
- Hits        10545    10544       -1     
+ Misses       8615     8613       -2     
- Partials      856      858       +2     

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[github-actions]

This issue is mentioned in release v1.8.2 🚀
Check out the entire changelog by clicking here