Refactor getCollectionIdHashCode() am: 62b60a16dd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/17366603

Change-Id: I0a5c5f7e3e1ca2d61b7de64bd3778c0f7fffedae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>