Correctly generate SSRC for RTPSender

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #39 (77f8bce) into master (490f43a) will increase coverage by 0.02%.
The diff coverage is 90.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
+ Coverage   87.34%   87.36%   +0.02%     
==========================================
  Files          14       14              
  Lines         664      673       +9     
==========================================
+ Hits          580      588       +8     
- Misses         84       85       +1     

Files	Coverage Δ
lib/ex_webrtc/rtp_sender.ex	100.00% <ø> (ø)
lib/ex_webrtc/rtp_transceiver.ex	91.37% <ø> (ø)
lib/ex_webrtc/peer_connection.ex	84.82% <90.90%> (+0.14%)	⬆️

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