fix network costs pod

[AjayTripathy]

Tested by setting networkCosts.enabled: true, with

1. networkCosts.additionalLabels: {}

2. additionalLabels.foo: bar

3. pods install as expected

NAME                                                READY   STATUS      RESTARTS   AGE
cost-analyzer-checks-1614183000-x4vxk               0/1     Completed   0          25m
cost-analyzer-checks-1614183600-tdrn6               0/1     Completed   0          15m
cost-analyzer-checks-1614184200-pd5rv               0/1     Completed   0          5m47s
kubecost-cost-analyzer-5fd9b487d5-m8fs6             3/3     Running     0          9m17s
kubecost-grafana-6df5cc66b6-6t4sg                   3/3     Running     0          11h
kubecost-kube-state-metrics-57d4dfc748-klkmk        1/1     Running     0          11h
kubecost-network-costs-942d6                        1/1     Running     0          8m57s
kubecost-network-costs-kcpk8                        1/1     Running     0          9m13s
kubecost-network-costs-n29j5                        1/1     Running     0          9m15s
kubecost-network-costs-n2bp4                        1/1     Running     0          8m54s
kubecost-network-costs-pf8fq                        1/1     Running     0          9m3s
kubecost-network-costs-xc62p 

2. pods have expected labels:

 kubectl get pods -n kubecost kubecost-network-costs-942d6  -o yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: "2021-02-24T16:26:51Z"
  generateName: kubecost-network-costs-
  labels:
    app: kubecost-network-costs
    controller-revision-hash: 6d875795c7
    foo: bar

[dwbrown2]

can you share how this was tested?