rtsp server: make runOnConnect work again

[aler9]

Linked to #1332

[codecov-commenter]

Codecov Report

Merging #1409 (0ab67cc) into main (ef214b7) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1409      +/-   ##
==========================================
+ Coverage   65.28%   65.49%   +0.20%     
==========================================
  Files         119      119              
  Lines       12891    12904      +13     
==========================================
+ Hits         8416     8451      +35     
+ Misses       3801     3785      -16     
+ Partials      674      668       -6     

Impacted Files	Coverage Δ
internal/core/rtsp_server.go	89.75% <100.00%> (+0.08%)	⬆️
internal/hls/muxer_variant_fmp4_playlist.go	61.39% <0.00%> (-4.87%)	⬇️
internal/core/webrtc_server.go	52.77% <0.00%> (-0.33%)	⬇️
internal/core/hls_muxer.go	50.94% <0.00%> (-0.25%)	⬇️
internal/core/webrtc_conn.go	54.56% <0.00%> (-0.17%)	⬇️
internal/core/path.go	70.74% <0.00%> (+0.33%)	⬆️
internal/core/externalauth.go	90.32% <0.00%> (+1.03%)	⬆️
internal/core/rtsp_source.go	52.12% <0.00%> (+1.21%)	⬆️
internal/core/rtmp_conn.go	67.21% <0.00%> (+4.45%)	⬆️
internal/core/rtsp_conn.go	83.58% <0.00%> (+9.49%)	⬆️

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