Faster dropdown animation for publish button
Faster dropdown animation for publish button

Closes #4390

- Apply same animation timing from the nav bar dropdown to the publish button dropdown

JohnONolan/Ghost-Admin,kevinansfield/Ghost-Admin,acburdine/Ghost-Admin,dbalders/Ghost-Admin,airycanon/Ghost-Admin,JohnONolan/Ghost-Admin,acburdine/Ghost-Admin,TryGhost/Ghost-Admin,dbalders/Ghost-Admin,TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,airycanon/Ghost-Admin