`namespaces destroy` needs to target wargames namespaces

`warnet admin namespaces destroy` [currently targets](https://github.com/bitcoin-dev-project/warnet/blob/7bc5ba71e90bf4ffebf54676e60f7cddb1d39758/src/warnet/namespaces.py#L65) *warnet-\** namespaces, but it should also target *wargames-\** and any other relevant namespaces