Batch unhide posts

[sam (Sam Saffron)]

Looks like @neil already took care of it

https://github.com/discourse/discourse/blob/14f9e559773d34ea7023fee06bf41a9ea17c2600/app/services/user_silencer.rb#L69-L75

We bracket on posts created in the last 24 hours. No wonder this issue has not popped up again.