Fixed radio buttons permanently being checked when outside of a group

[blackbaud-conorwright]

Resolves: #1981

[Blackbaud-AlexKingman]

LGTM. Thanks for putting in better coverage around the radios too!

🚢 🇮🇹

[codecov-io]

Codecov Report

Merging #1982 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1982   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         422     422           
  Lines        8994    8993    -1     
  Branches     1333    1332    -1     
======================================
- Hits         8994    8993    -1

Impacted Files	Coverage Δ
src/modules/radio/radio.component.ts	100% <100%> (ø)	⬆️

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