When using #force at a spot which has a broken or unlocked chest (or
large box) whose lock state has been previously discovered, avoid
|There is a broken chest here, but its lock is already broken.
|There is an unlocked chest here, but its lock is already unlocked.
by suppressing "broken"/"unlocked" from the chest description for
that particular message.
We might still want to change "broken chest" to "damaged chest" but
I don't think there should be any reference to its lock as the reason
it's broken or damaged. The fact that #loot, #force, and applying a
key still treat it as a container is sufficient to reveal that it
functions as one.