Fix bundle preview icon animation by fixing where we reverse.

Change I36e515164d4a6febad90f9dba26dce5795aecf05 attempted to fix this by adjusting the layout position of the icons, but that didn't account for the STL transitions of each icon element being static based on where the icon is relative to the expander. As a result, the icons had a strange staggering disappearance, different from the design.

Test: manual
Fixes: 424616749
Flag: com.android.systemui.notification_bundle_ui
Change-Id: Id8cdb1dce647767ce37a527134e6dfbeee010c17