Automatic leaving of upgraded rooms is more obtrusive than helpful

[turt2live]

It seems like more and more people are running into issues where they want to leave the old version of the room (which may very well be a hopeless effort depending on room version), but Riot tries to help and ends up making them leave all versions of that room. We should consider disabling the behaviour when not looking at the most-current version of the room, or possibly expose a checkbox for it.

[aaronraimist]

Duplicate of #10380 (has 6 thumbs)