Cleanup ingresses from list once deleted
Cleanup ingresses from list once deleted

- Previously, resources would be deleted from AWS but there was no
guarantee the ALBIngress would be removed from the list of ALBIngresses.
Eventually it would be removed when an AWS sync occured.

- This commit checks after reconcile for any LoadBalancers that have the
deleted flag set to true. When this is the case it's removed from the
ALBIngress list.

mgoodness/alb-ingress-controller,mgoodness/alb-ingress-controller