Remove active class from buttons.
Remove active class from buttons.

refs #3989
- Remove active class from {{#link-to tagName="button" ..}}

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