Fix ICECandidate types

[roznawsk]

Fix type defnitions to match the actual types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.10%. Comparing base (f13a6b4) to head (5a3fb74).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   87.89%   88.10%   +0.21%     
==========================================
  Files          47       47              
  Lines        2370     2370              
==========================================
+ Hits         2083     2088       +5     
+ Misses        287      282       -5     

Files with missing lines	Coverage Δ
lib/ex_webrtc/ice_candidate.ex	0.00% <ø> (ø)
lib/ex_webrtc/peer_connection.ex	85.84% <ø> (ø)

... and 4 files with indirect coverage changes

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