Fix update track metadata

[Karolk99]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 54.69%. Comparing base (77e5bc5) to head (f819224).

Files with missing lines	Patch %	Lines
webrtc/lib/webrtc_endpoint.ex	0.00%	9 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
- Coverage   54.87%   54.69%   -0.18%     
==========================================
  Files          75       75              
  Lines        3357     3366       +9     
==========================================
- Hits         1842     1841       -1     
- Misses       1515     1525      +10     

Files with missing lines	Coverage Δ
webrtc/lib/webrtc_endpoint.ex	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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