Fix failing tests

src/headless/plugins/muc/tests/muc.js

@@ -139,7 +139,6 @@ describe("Groupchats", function () {
             expect(Strophe.serialize(pres)).toBe(
                 `<presence from="${_converse.jid}" id="${pres.getAttribute('id')}" to="coven@chat.shakespeare.lit/romeo" xmlns="jabber:client">`+
                     `<x xmlns="http://jabber.org/protocol/muc"><history maxstanzas="0"/></x>`+
-                    `<show>online</show>`+
                     `<c hash="sha-1" node="https://conversejs.org" ver="TfHz9vOOfqIG0Z9lW5CuPaWGnrQ=" xmlns="http://jabber.org/protocol/caps"/>`+
                 `</presence>`);
         }));