notifyTaskbarStatus in taskbar phone mode

This fixes notification shade not being able to swipe up to the edge during animation because it listens to the task bar visibility signal

Fixes: 352365691
Test: https://b.corp.google.com/issues/352365691#comment28
Flag: com.android.wm.shell.enable_taskbar_on_phones
Change-Id: I10d6f49d087dd85b3a8bc5894f76f5d46ba4a865