If a topic is soft deleted through a moderator, the topic_delete_user is set.
If it is passively soft deleted (f.e. while the only approved post is deleted)
the topic_delete_user is not set. This way, we can distinguish between these
two cases. The same also applies to unapproved posts. So we need to set the
topic_delete_user when an unapproved topic is posted.
Topics that were soft deleted/unapproved by a user (rather then passive) are
going to be displayed in the Topics modules, while all others are in the posts
modules of the MCP queue.
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