[Flexi] Fix swipe from touchable status bar elements not going through to the shade.

The previous fix ag/34061545 is incomplete because the shade window does not receive
any ACTION_DOWN event.

Test: Manually ensure gesture behavior is identical over chips compared to the rest of the status bar.
Test: PhoneStatusBarViewControllerTest
Bug: 359192607
Flag: com.android.systemui.scene_container
Change-Id: I61c0100c2cd7961bfd6d2f648e52535b24a0dc0c