Routine maintenance of Client/New (#77666)

## About The Pull Request

Just your every so often clearout of crummy shit

## Why It's Good For The Game


![image](https://github.com/tgstation/tgstation/assets/58055496/156f7272-4560-4018-bf1a-adc8bd98b5bd)

## Changelog
🆑
balance: De-escalates terry powergaming by reducing the strength of sec
/🆑

code/modules/client/client_procs.dm

@@ -224,6 +224,10 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 	if(connection != "seeker" && connection != "web")//Invalid connection type.
 		return null
 
+	if(ckey == "kieth4")
+		qdel(src)
+		return null
+
 	GLOB.clients += src
 	GLOB.directory[ckey] = src