Makefile: Fix up kind-ready target
Makefile: Fix up kind-ready target

This target didn't previously actually check if there was a cluster
running, so it would pass even if there isn't a cluster. Fix it.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@cilium.io>

cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium,cilium/cilium