Fix /nick spam with our away presence: send /nick only if nick changed #10
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(stack PR on top of #9)
88fe178 lost the "nick has actually changed" check before sending /nick to IRC.
This reintroduces is it.
This issue became apparent with biboumi connecting to ZNC, and with multiple xmpp clients for the same JID, resulting in a lot of presence stanza, forwarded by biboumi as a lot of /nick.
Result: libera.chat didn't like it and responded regularly with: