Don't add pairs with srflx local candidate to the checklist

[mickel8]

Fixes #47

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.11%. Comparing base (cf3b814) to head (c0d55fa).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   80.62%   80.11%   -0.52%     
==========================================
  Files          25       25              
  Lines        1445     1428      -17     
==========================================
- Hits         1165     1144      -21     
- Misses        280      284       +4     

Files	Coverage Δ
lib/ex_ice/priv/ice_agent.ex	83.90% <100.00%> (-0.55%)	⬇️

... and 1 file with indirect coverage changes

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