mod_websocket: Merge session close handling changes from mod_c2s (bug fixes)origin/13.013.0

This should bring some fixes and general robustness that mod_websocket had
missed out on. The duplicated code here is not at all ideal. To prevent this
happening again, we should figure out how to have the common logic in a single
place, while still being able to do the websocket-specific parts that we need.

The main known bug that this fixes is that it's possible for a session to get
into a non-destroyable state. For example, if we try to session:close() a
hibernating session, then session.conn is nil and the function will simply
return without doing anything. In the mod_c2s code we already handle this, and
just destroy the session. But if a hibernating websocket session is never
resumed or becomes non-resumable, it will become immortal!

By merging the fix from mod_c2s, the session should now be correctly
destroyed.

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