Tweak and bug fix to modified tipsy and diff link

1. The modified icon should not display when a topic is hidden

2. The modified icon should not display when the only change is status change

3. The diff link should not display if there is no content change other than status change

Bug: 59629

Change-Id: I58230f94147464caa98e3a2fab3a1c64b56a9fde
Merge "Tweak and bug fix to modified tipsy and diff link"