rancher2_app_v2 values not passed to sub charts

[davidtron]

We have a private registry that we are using for an airgapped install.
When we try to install rancher-monitoring using the terraform provider the systemDefaultRegistry is not passed through to the rancher-monitoring-crd subchart.

resource "rancher2_app_v2" "rancher-monitoring" {
  cluster_id = "blah"
  name = "rancher-monitoring"
  namespace = "cattle-monitoring-system"
  repo_name = "rancher-charts"
  chart_name = "rancher-monitoring"
  chart_version = "9.4.200"
  values = <<EOF
global:
  cattle:
    systemDefaultRegistry: "nexus3..."
EOF
}

We believe that this is due the fact that the provider only passes through cattle, clusterId, and clusterName to the subchart

[rawmind0]

Issue reproduced. Added a patch to fix it at PR #538