aria live: user name remains logged in name

[albertotirla]

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steps to reproduce

• open a stream
• if you're not a regular user, you may have to change your name from the random one, do so. Alternatively, remember your random name for the duration of this experiment
• if the stream has a system message, aria live will contain <username> said <message>, where <username> is the name you got from owncast or set yourself
• have someone else send a chat message

expected behaviour

aria live should contain the username of the person who wrote the message

actual behaviour

the same name as the username you initially started with gets reported for all chat messages