client: Fixed incorrect numeric being listened to for nick errors.

client.go

@@ -763,7 +763,7 @@ func (client *Client) handleEvent(event *Event) {
 			client.Sendf("WHO %s", event.Args[0])
 		}
 
-	case "packet.443":
+	case "packet.431", "packet.432", "packet.433", "packet.436":
 		{
 			client.mutex.RLock()
 			hasRegistered := client.nick != ""

client_test.go

@@ -37,13 +37,13 @@ func TestClient(t *testing.T) {
 			{Kind: 'C', Data: "CAP REQ :multi-prefix userhost-in-names"},
 			{Kind: 'S', Data: ":testserver.example.com CAP * ACK :multi-prefix userhost-in-names"},
 			{Kind: 'C', Data: "CAP END"},
-			{Kind: 'S', Data: ":testserver.example.com 443 * Test :Nick is not available"},
+			{Kind: 'S', Data: ":testserver.example.com 433 * Test :Nick is not available"},
 			{Kind: 'C', Data: "NICK Test2"},
-			{Kind: 'S', Data: ":testserver.example.com 443 * Test2 :Nick is not available"},
+			{Kind: 'S', Data: ":testserver.example.com 433 * Test2 :Nick is not available"},
 			{Kind: 'C', Data: "NICK Test3"},
-			{Kind: 'S', Data: ":testserver.example.com 443 * Test3 :Nick is not available"},
+			{Kind: 'S', Data: ":testserver.example.com 433 * Test3 :Nick is not available"},
 			{Kind: 'C', Data: "NICK Test4"},
-			{Kind: 'S', Data: ":testserver.example.com 443 * Test4 :Nick is not available"},
+			{Kind: 'S', Data: ":testserver.example.com 433 * Test4 :Nick is not available"},
 			{Kind: 'C', Data: "NICK Test768"},
 			{Kind: 'S', Data: ":testserver.example.com 001 Test768 :Welcome to the TestServer Internet Relay Chat Network test"},
 			{Kind: 'C', Data: "WHO Test768*"},