fix: avoid including scope_id in IPv6Address object if its zero

[bdraco]

If the scope_id is 0 it should not be included in the IPv6Address object

fixes #1361

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.75%. Comparing base (517d7d0) to head (99aa376).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1367      +/-   ##
==========================================
- Coverage   99.75%   99.75%   -0.01%     
==========================================
  Files          30       30              
  Lines        3238     3235       -3     
  Branches      536      536              
==========================================
- Hits         3230     3227       -3     
  Misses          5        5              
  Partials        3        3              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.