[Settingslib] Fix ActionButton for CollapsingToolbarAppCompatActivity

- Add support toolbar for expressive design with action button.

Test: Manual test
Bug: 410946636
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: I94abd7abf0a6c3bc0d3a013f3cbf67514ada07d2