Remove obsolete "Has profile owner" from UserManagerService#dumpUserLocked()

Now that Bedstead has been updated (ag/33632105), the "Has profile
owner" line no longer needs to be included in the dump.

Bug: 258213147
Flag: EXEMPT related to a flag removal
Test: presubmit
Change-Id: I1c93e36e72bb57200136816d7979dcee65710dcd