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

This reverts commit 5460d7fa0cd13f84ff567c96ee89d07b37cd4b62.

Bug:10329
Change-Id: I6f13f9c18bb23fd10b3a574e42ad2d3f6c7beadb
Reviewed-on: https://code.wireshark.org/review/4092
Reviewed-by: Jeff Morriss <jeff.morriss.ws@gmail.com>