Use correct constant for UIView animation options

``UIView`` ``-animateWithDuration:options:animations:completion:`` requires options to be of the enum type ``UIViewAnimationOptions``. Replaced the wrong constants ``UIViewAnimationCurveEaseIn`` and ``UIViewAnimationCurveEaseOut`` with ``UIViewAnimationOptionCurveEaseIn`` and ``UIViewAnimationOptionCurveEaseOut`` respectively. This fixed an error that caused the popups to stack when rapidly dismissing and showing them.