Do not remove uninstalled packages from journal

The point of this journal is to remember whether a package was ever
backed up on the device, so as to know, when re-installing a package,
which restore set to restore from (i.e., the restore set of the
current device - if the package has been backed up on the current
device - or the restore set of the ancestral device).

Bug: 63794452
Test: Manual
Change-Id: I6519ed625124487ffb09b7c3899550e4d791e0df