Filters should add post-hidden class to post container rather than post

[jeblack3]

Requesting that when filters hide a post, they add the "post-hidden" class to the post container (containing both the post and the ">>" or hide button) rather than just the post. This will make it possible for people hiding replies using filters to hide the stubs using custom CSS such as:

.post-hidden {display:none!important}

See
https://boards.4chan.org/q/res/775918
for someone who wants to do this.

The hide reply button already behaves this way, and this change would make the behavior of filters and the hide reply button consistent.