Description of problem:
The downloads pods deploy on woker nodes by the console operators. But some users don't like that, so please improve it so that it can be set to master fixed.

Version-Release number of selected component (if applicable):
OCP4.6

How reproducible:

After installed cluster.

$ oc get pod -o wide 
NAME                         READY   STATUS    RESTARTS   AGE     IP            NODE                                              NOMINATED NODE   READINESS GATES
console-857895b985-4tbzr     1/1     Running   0          7d18h   10.128.0.4    ip-10-0-206-223.ap-northeast-1.compute.internal   <none>           <none>
console-857895b985-swv87     1/1     Running   0          7d18h   10.129.0.21   ip-10-0-158-151.ap-northeast-1.compute.internal   <none>           <none>
downloads-5b94cdbbf4-69cmk   1/1     Running   0          7d18h   10.131.0.11   ip-10-0-184-184.ap-northeast-1.compute.internal   <none>           <none>
downloads-5b94cdbbf4-g77x9   1/1     Running   0          7d18h   10.128.2.19   ip-10-0-216-121.ap-northeast-1.compute.internal   <none>           <none>
]$ oc get node
NAME                                              STATUS   ROLES    AGE   VERSION
ip-10-0-135-95.ap-northeast-1.compute.internal    Ready    worker   20d   v1.19.0+d670f74
ip-10-0-158-151.ap-northeast-1.compute.internal   Ready    master   20d   v1.19.0+d670f74
ip-10-0-180-101.ap-northeast-1.compute.internal   Ready    master   20d   v1.19.0+d670f74
ip-10-0-184-184.ap-northeast-1.compute.internal   Ready    worker   20d   v1.19.0+d670f74
ip-10-0-206-223.ap-northeast-1.compute.internal   Ready    master   20d   v1.19.0+d670f74
ip-10-0-216-121.ap-northeast-1.compute.internal   Ready    worker   20d   v1.19.0+d670f74

Actual results:
The downloads pods deploy on woker nodes by the console operators.

Expected results:
They should be on controle plane nodes.

Additional info:

The console pods deploy on mater nodes by the NodeSelector.

https://github.com/openshift/console-operator/blob/5c37bd88347626255fb043a7b23cda71e90de3f3/pkg/console/subresource/deployment/deployment.go#L118

```
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Name:        api.OpenShiftConsoleName,
					Labels:      labels,
					Annotations: podAnnotations,
				},
				Spec: corev1.PodSpec{
					ServiceAccountName: "console",
					// we want to deploy on master nodes
					NodeSelector: map[string]string{
						// empty string is correct
						"node-role.kubernetes.io/master": "",
					},
```