Start compat user select storage after targetSDK U, not T

When an app targets T sdk, we no longer show the compat user select
storage behavior, unless the app explicitly adds the user select
permission. We will show the two button prompt instead.

Bug: 299621675
Relnote: adjustment of feature behavior
Test: atest PhotoPickerPermissionTest
Change-Id: Ib88e63544298f26473bd0536e9d862eb6e1e0972
Merged-In: I196061fde8c0eba106ff7d09a6c62593df359794