macosx: Improve animation for media supplementary views

This PR makes the animation for opening and closing the supplementary view use a easing cubic out curve, making the animation more appealing

Cubic easing out:

Screen_Recording_2022-07-27_at_21.36.58

Linear (old animation):

Screen_Recording_2022-07-27_at_21.38.22

Signed-off-by: Claudio Cambra claudio.cambra@gmail.com