PackageSettingBase needs to copy volume UUID.

When copying all fields from one PackageSettingBase to another, we
also need to copy volumeUuid, which had previously been missed.

Without this, packages using sharedUserId that are installed on
adopted storage devices will be destroyed, since after reboot we
think they actually belong on internal storage (where volumeUuid is
null).

Bug: 25334169
Change-Id: I223361bd1e19e7d5dd78626682ac7c5cbecb9fa1