change DataChannel::accept 3rd argument to be a ref

[melekes]

webrtc-rs/webrtc#219 (comment)

[codecov]

Codecov Report

Merging #15 (5fbccb0) into main (6123610) will increase coverage by 0.15%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   15.06%   15.21%   +0.15%     
==========================================
  Files           7        7              
  Lines        3299     3305       +6     
  Branches      960      960              
==========================================
+ Hits          497      503       +6     
- Misses       2518     2520       +2     
+ Partials      284      282       -2     

Impacted Files	Coverage Δ
src/data_channel/data_channel_test.rs	45.49% <50.00%> (+0.78%)	⬆️
src/lib.rs	6.90% <0.00%> (ø)

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