Publish OMEMO bundle and device list with publish-options regardless of the
server domain's advertised features.

connection_supports() only inspects features_by_jid, which connection.c seeds
with the server domain (conn.domain) plus whatever disco#items returns for that
domain. The account's own bare JID -- which is what actually hosts the PEP
service used for OMEMO -- is never added to that table. On deployments whose
host disco#info is trimmed down, the check therefore fails even though the
account itself advertises
http://jabber.org/protocol/pubsub#publish-options.

Two separate symptoms follow:

  * omemo_bundle_publish() returned early and sent nothing at all, so the
    bundles:<device_id> node was never created. Contacts fetching it got
    item-not-found and no session could ever be established.

  * omemo_devicelist_publish() published without publish-options, so the
    devicelist node was auto-created with the server's default access model
    (presence on Prosody) instead of open. Contacts without a presence
    subscription could not read the device list, so they never learned which
    bundle to request.

Send publish-options unconditionally in both cases. If a server genuinely
rejects them, the existing recovery paths handle it: _omemo_bundle_publish_result()
falls back to configuring the node explicitly, and _omemo_devicelist_publish_result()
reconfigures on precondition-not-met.

--- a/src/xmpp/omemo.c
+++ b/src/xmpp/omemo.c
@@ -44,11 +44,7 @@
 
     log_debug("[OMEMO] publish device list");
 
-    if (connection_supports(XMPP_FEATURE_PUBSUB_PUBLISH_OPTIONS)) {
-        stanza_attach_publish_options(ctx, iq, "pubsub#access_model", "open");
-    } else {
-        log_debug("[OMEMO] Cannot publish devicelist: no PUBSUB feature announced");
-    }
+    stanza_attach_publish_options(ctx, iq, "pubsub#access_model", "open");
 
     iq_id_handler_add(xmpp_stanza_get_id(iq), _omemo_devicelist_publish_result, NULL, NULL);
 
@@ -90,11 +86,6 @@
 void
 omemo_bundle_publish(gboolean first)
 {
-    if (!connection_supports(XMPP_FEATURE_PUBSUB_PUBLISH_OPTIONS)) {
-        cons_show("OMEMO: Cannot publish bundle: no PUBSUB feature announced");
-        log_debug("[OMEMO] Cannot publish bundle: no PUBSUB feature announced");
-        return;
-    }
     log_debug("[OMEMO] publish own OMEMO bundle");
     xmpp_ctx_t* const ctx = connection_get_ctx();
     unsigned char* identity_key = NULL;