Fix selected widget outline

This change fixes the following issues
- the outline is not visible when a widget is selcted in edit mode
- widgets have more vertical padding in edit mode due to calculation of
  content padding not taking the height of system bars into account
- the CTA tiles have an outline padding making them smaller than other
  content

Bug: 327253807
Fix: 327253807
Test: verified that outline is visible when a widget is selected
Flag: ACONFIG com.android.systemui.communal_hub STAGING
Change-Id: I4a41d83d49ab911a3bb0ae2d76fac195125593c6