Revert "fix(client-registry): remove temp net id from m_clientsByNetI…

…d when 'joining'"

This change was suspected (on Matrix in #main:cfx.re) to cause compat
issues with some ways of handling player connections.

https://matrix.to/#/!rUiwxlJvpdAOiTowFn:cfx.re/$Zy6GJR5TXYuVTb8b4EeWBKXE2oVeuYhjqQXObby23_c?via=cfx.re&via=matrix.org&via=t2bot.io

This reverts commit 3800625.

code/components/citizen-server-impl/src/ClientRegistry.cpp

@@ -223,7 +223,6 @@ namespace fx
 			events->TriggerClientEvent("onPlayerJoining", target, client->GetNetId(), client->GetName(), bigModeSlot);
 		}
 
-		m_clientsByNetId[oldNetID].reset();
 		// trigger connection handlers
 		OnConnectedClient(client.get());
 	}