Remove IPv6DualStack feature gate (#224)

This is locked to `true` by default.

Author: ibalutoiu-cbsl

kubeadm/kube-proxy/kube-proxy.yml

@@ -42,7 +42,6 @@ data:
     yq w -i /host/var/lib/kube-proxy/config.conf winkernel.sourceVip $sourceVip
     yq w -i /host/var/lib/kube-proxy/config.conf winkernel.networkName $networkName
     yq w -i /host/var/lib/kube-proxy/config.conf featureGates.WinOverlay true
-    yq w -i /host/var/lib/kube-proxy/config.conf featureGates.IPv6DualStack false
     yq w -i /host/var/lib/kube-proxy/config.conf mode "kernelspace"
     
     # Start the kube-proxy as a wins process on the host.