Changes Hub quick picker to get current wallpaper from preferences am: a0eb054ffd am: 6a4b86d2ae

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/22160507

Change-Id: I0075fdb6e7f91cdd0716509b4a1aad6d6e797c96
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>