btn-group-vertical gaps with labels toggle buttons

Created by: dmytroyarmak

Basically, It's the same issue as #20298 (closed). It has come back after this commit: https://github.com/twbs/bootstrap/commit/fd75c4127988a9d61c3fec208b398763b68ae338#diff-1d4d8b38bd14870d2fb32469b746d503L13