fix: fix dropdown aria-labelledby from its anchor id
fix: fix dropdown aria-labelledby from its anchor id

Introduced in https://github.com/zurb/foundation-sites/pull/10360 (https://github.com/zurb/foundation-sites/pull/10360/commits/36521fb40fd438c14925208020128311c0dddeaa)
Closes https://github.com/zurb/foundation-sites/issues/10627

abdullahsalem/foundation-sites,denisahac/foundation-sites,dragthor/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,zurb/foundation,denisahac/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,zurb/foundation-sites,atmmarketing/foundation-sites,colin-marshall/foundation-sites,abdullahsalem/foundation-sites,colin-marshall/foundation-sites,atmmarketing/foundation-sites,atmmarketing/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,denisahac/foundation-sites,colin-marshall/foundation-sites,dragthor/foundation-sites,dragthor/foundation-sites,zurb/foundation-sites