chore(tabs): Fixes active tab selection in xs screens
chore(tabs): Fixes active tab selection in xs screens

[finishes #99800334]

Signed-off-by: Dominick Reinhold <53edd8063ac00c24e01011391e7d4e2e47cc2f1f@pivotal.io>

sjolicoeur/pivotal-ui,CanopyCloud/pivotal-ui,sjolicoeur/pivotal-ui,pivotal-cf/pivotal-ui,npm/pivotal-ui,sjolicoeur/pivotal-ui,npm/pivotal-ui,pivotal-cf/pivotal-ui,npm/pivotal-ui,pivotal-cf/pivotal-ui,CanopyCloud/pivotal-ui,sjolicoeur/pivotal-ui,CanopyCloud/pivotal-ui