Fix scroll with image visibility.

[Jaehwa-Noh]

Fix #962, fix #889

Connect Scroll and image visibility correctly by using detail app bar height.

[riggaroo]

Hi,
Thanks for your contribution, however Sunflower is going to be archived in favour of maintaining a smaller set of up-to-date set of compose-samples, that can be found here: https://github.com/android/compose-samples, as well as snippets that can be found here: https://github.com/android/snippets.

Please feel free to keep your fork up-to-date for your learning, but this repository will be archived shortly.