Config: Rename inbounds' clients/accounts to users (#6083)

https://github.com/XTLS/Xray-core/pull/6055#issuecomment-4363896372
https://github.com/XTLS/Xray-core/pull/6082#issuecomment-4384523482

proxy/vless/inbound/inbound.go

@@ -58,7 +58,7 @@ func init() {
 		c := config.(*Config)
 
 		validator := new(vless.MemoryValidator)
-		for _, user := range c.Clients {
+		for _, user := range c.Users {
 			u, err := user.ToMemoryUser()
 			if err != nil {
 				return nil, errors.New("failed to get VLESS user").Base(err).AtError()