Message Filtering: "USERNAME" target not working

Hey, I'm not sure whether I'm misunderstanding how this option is supposed to work (ignoring messages/events from a specific username?) or if it's maybe bugged.

I used the online config editor and tried a variety of different options (including "CONTAINS" instead) but none of the messages/events were ignored when the type is set to "USERNAME". It works fine with the "CHAT" type for filtering based on message content.

```
#Configure message/username filtering for discord messages
[filtering]
#Enable the filter system
enabled = true
#Ignore messages sent from certain threads. Enable debug logging to see what thread the message is from
ignoredThreads = []

#List of entries to process
[[filtering.entries]]
search = "aelobin"
target = "USERNAME"
replace = ""
searchMode = "MATCHES"
action = "IGNORE"
appliesTo = "DISCORD"
ignoreConsole = false
```

Using v3.3.2 on 1.20.1

Thanks