Update drawables for confirm and delete button

Specs were updated to use different delete icons for auto-confirm (transparent) mode vs when auto-confirm is not enabled.
Confirm button icon changed after UX feedback.

Bug: 394136959
Test: verified manually
Flag: com.android.systemui.bouncer_ui_revamp_2
Change-Id: I262c283bbeb61f65f1d437a2afc46c74f88830c0