mod_push: Also include sender/body for carbons

If the 'include_sender' and/or 'include_body' options are specified,
also include a urn:xmpp:push:summary form in push notifications that are
generated for carbon-copied messages (with a body).

src/mod_push.erl

@@ -346,7 +346,7 @@ c2s_stanza(State, #stream_error{}, _SendResult) ->
 c2s_stanza(#{push_enabled := true, mgmt_state := pending} = State,
 	   Pkt, _SendResult) ->
     ?DEBUG("Notifying client of stanza", []),
-    notify(State, Pkt),
+    notify(State, xmpp_util:unwrap_carbon(Pkt)),
     State;
 c2s_stanza(State, _Pkt, _SendResult) ->
     State.