Remove ic2 from ice-options

[JoeTurki]

Description

Remove ic2 from ice-options

Reference issue

I think the general idea is right here. But do NOT put ice2 into the ice-options here. Pion doesn't support ice2 yet. That is whole different big project.
For this issue and PR we should only add a=ice-options:trickle.

pion/webrtc#3097

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.29%. Comparing base (f0c4982) to head (2ed82a4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
- Coverage   71.33%   71.29%   -0.04%     
==========================================
  Files          12       12              
  Lines        1664     1662       -2     
==========================================
- Hits         1187     1185       -2     
  Misses        379      379              
  Partials       98       98              

Flag	Coverage Δ
go	71.11% <100.00%> (-0.04%)	⬇️
wasm	71.29% <100.00%> (-0.04%)	⬇️

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