Typo in environment name: FLUENT_FOWARD_HOST

[bwinter]

I think it should be FORWARD.

Here: https://github.com/fluent/fluentd-kubernetes-daemonset/blob/master/docker-image/v1.15/debian-forward/conf/fluent.conf#L15-L16

and

Here: https://github.com/fluent/fluentd-kubernetes-daemonset/blob/master/fluentd-daemonset-forward.yaml#L29-L32

[github-actions]

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[cosmo0920]

Can we handle this issue, @ashie?