fix(XmppConnection): use status instead of the connected field
fix(XmppConnection): use status instead of the connected field

The connected flag is flipped to true as soon as transport connection is
established by Strophe(such as WebSocket TCP), but it doesn't mean that
the connection is ready to send stanzas yet.

jitsi/lib-jitsi-meet,jitsi/lib-jitsi-meet,jiyeyuran/lib-jitsi-meet,damencho/lib-jitsi-meet