[OMEMO]: Fix bundle publishing

Use the following options in `omemo_bundle_publish()`:

- "pubsub#persist_items" = "true"
- "pubsub#access_model" = "open"

The same options are also used in Gajim.

I've tested this on two different servers. The bundle was successfully
added as a new PEP node. Test cases:

1. Normal use on my main account
2. Log in into a fresh tesst account on a different server
3. `/omemo clear_device_list`. In this case, the client(s) may have to
   be restarted.

Note: In `_omemo_bundle_publish_result`, there's a route that is taken
when the bundle publish stanza failed. In this case, the node is
configured manually, i.e. the access_model is set to 'open'. I have
manually tested this case, but this case didn't naturally occur for me.

Note: The option "pubsub#max_items=max" is REQUIRED for the bundle
publication, as per XEP-0384. However, this is not done in other clients
(I've checked the source code of Gajim and Conversations), and it is
also not supported by Prosody. Cf. <https://github.com/xsf/xeps/pull/988>.

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