Revert "Only fake an item by returning 'tree' if they use the same TVB"

Bug: 10329
This reverts commit becb4d7837dbb506ec6359a72f7adbf0166ae0a2.

Change-Id: I7a291beb52171eedd8d21e1f3ac2e5a33aea6a70
Reviewed-on: https://code.wireshark.org/review/4110
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>