Fix the overflow not being added sometimes

The runnable to add the overflow was only being run when the view
was animated (i.e. while expanded); not when it was collapsed.

Flag: com.android.wm.shell.enable_bubble_bar
Bug: 358304168
Test: manual - add more than 5 bubbles while collapsed
Change-Id: Ibdea61eaf8ecb1d2e3f9ea4fced679b2826d3f9b