[SB][Chip] Always announce the screen record countdown chip for a11y.

Fixes: 407793362
Bug: 372657935
Flag: com.android.systemui.status_bar_chips_modernization
Test: Start screen recording -> verify 3-2-1 countdown is announced to
accessibility (usually only one or two of the numbers is announced
because there's a lot of conflicting announcements at the same time, but
I usually hear at least one of the numbers)
Change-Id: I768744b0361c9abd1bb226b36391829359f17724

Change-Id: Ib8b32313022c78b947db87d6c05e252df0c14a5d