+ revert: (line-height) changes from "_top_bar.scss" 

revert from this commit -> https://github.com/zurb/foundation/commit/cc00c427f7cc76086c6d9aaff335ab70a9de45dd

issues:
-> https://github.com/zurb/foundation/issues/4979
-> https://github.com/zurb/foundation/issues/4974