fix(caps): Add features in caps_init to avoid redundant presence updates

Previously, features like `XMPP_FEATURE_OMEMO_DEVICELIST_NOTIFY` were
added in separate init methods (e.g., `omemo_devicelist_subscribe`) via
`caps_add_feature`, triggering `cl_ev_presence_send` and sending multiple
"online" XMPP presence stanzas. This caused other clients to see users
as appearing "online" multiple times.

This change adds `STANZA_NS_MOOD_NOTIFY` and
`XMPP_FEATURE_OMEMO_DEVICELIST_NOTIFY` in `caps_init`, ensuring they are
in `prof_features` early. This allows `caps_add_feature` to exit early
when called for these features, avoiding redundant presence updates.

src/xmpp/capabilities.c

@@ -119,6 +119,14 @@ caps_init(void)
         g_hash_table_add(prof_features, strdup(STANZA_NS_LAST_MESSAGE_CORRECTION));
     }
 
+    if (prefs_get_boolean(PREF_MOOD)) {
+        g_hash_table_add(prof_features, strdup(STANZA_NS_MOOD_NOTIFY));
+    }
+
+#ifdef HAVE_OMEMO
+    g_hash_table_add(prof_features, strdup(XMPP_FEATURE_OMEMO_DEVICELIST_NOTIFY));
+#endif
+
     my_sha1 = NULL;
 }