CURRENT STATE instead of LAST STAT
CURRENT STATE instead of LAST STAT

With Docker version 18.09.1, build 4c52b90, the command `docker service ps helloworld` shows CURRENT STATE instead of LAST STATE.

Here is my example output of the command:
```
[root@docker01 ~]$docker service ps helloworld
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
3tj4b0gho76v        helloworld.1        alpine:latest       docker01            Running             Running 3 minutes ago

[root@docker01 ~]$ docker --version
Docker version 18.09.1, build 4c52b90
```
docker/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,londoncalling/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,londoncalling/docker.github.io