Only trigger feedback when drawer position changed with animation

[florianbuerger]

Not sure if that is in the scope of the whole project:

Having haptic feedback when a drawer change occurred without animation (likely not due to a user action) feels wrong to me. I moved the triggerFeedbackGenerator() call into the animation block and it feels much better.

Happy to add the PR if you think this is a good idea. Otherwise feel free to just close this 😊