fixed https port forwarding in Azure LB service

[itaysk]

443 was redirected to named port 'http' instead of 'https' (points to https://github.com/kubernetes/ingress-nginx/blob/master/deploy/provider/patch-service-without-rbac.yaml#L35)
In the AWS/GCP examples it was fine ('https') so I fixed it for azure as well.

[k8s-reviewable]

This change is 

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[coveralls]

Coverage remained the same at 33.555% when pulling f5ddf6a on itaysk:patch-1 into d3eef04 on kubernetes:master.

[aledbf]

/lgtm

[aledbf]

@itaysk thanks!