Don't update publisher version code without scanning manifest

- It was (theoretically) possible for shortcut manager to update
the version code for a publisher package without rescanning manifest
shortcuts, if backup happens right after unlocking a user before
SM searches for updated packages.  If it happens, then SM will not
scan the manifest for this package until it's updated next time.

So don't refresh the version code during backup, which we only
have to do for launchers but not publishers.

- Also fix the owner-user-id for launchers.  (Luckily it's not causing
any issues.)

Bug 31402152

Change-Id: I5d898eb3882b74edaca8b2d5f960849370ffc23b