dropdowns.scss: Fix style issues after review
dropdowns.scss: Fix style issues after review

Signed-off-by: David Wagner <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@marvid.fr>

stoplightio/gitlabhq,darkrasid/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,darkrasid/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,iiet/iiet-git,htve/GitlabForChinese,stoplightio/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,mmkassem/gitlabhq,LUMC/gitlabhq,axilleas/gitlabhq,openwide-java/gitlabhq,htve/GitlabForChinese,openwide-java/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,darkrasid/gitlabhq,openwide-java/gitlabhq,openwide-java/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,dreampet/gitlab,dplarson/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,LUMC/gitlabhq,t-zuehlsdorff/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,htve/GitlabForChinese,jirutka/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,LUMC/gitlabhq