Revert "Change quickstep onboarding tip window type to"

This reverts commit 4df16fb1.

Reason for revert: This change does not really fix the z-layering while this issue is mitigated by the the update of the tip UI. It also causes b/109836271

Fixes: b/73990691
Fixes: b/109836271
Test: Manual test
Change-Id: I6443e7d54e535e353a9ffc71c48ef8b6c3f47972