Remove stripe merchant for nsfw users on flag. #1630

Closes #1630 (closed)

Depends on front!1181 (merged)

I checked and it doesn't appear that the option is there to set up stripe when a user is NSFW - It displays a message at the bottom of the wallet component explaining.

So this MR just means that when an admin is flagging NSFW, if the $user->merchant is set, we delete the merchant.