Correctly close PSM
Correctly close PSM

closes #4077
- Swap CSS toggling for new PSM closing method

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