gw-choice-counter.php: Added support for counting Radio Button choices.
#598
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Can be used to count the number of Radio Button fields with a specific choice checked (e.g. "N/A").
Context
⛑️ Ticket(s): https://secure.helpscout.net/conversation/2105380160/42151/
Summary
Customer needed a way to count the number of times an "N/A" choice was selected across a number of Radio Button fields. @saifsultanc recently added support for counting specific choices to this snippet (#586) so it seemed like a natural extension to add support for Radio Buttons.