Faucet: leave just an address as the default value

[fadeev]

Let's leave just the address ast the default value in the faucet's API, so that a user gets both token and stake just by changing the address and hitting the button.

{
  "address": "cosmos1uzv4v9g9xln2qx2vtqhz99yxum33calja5vruz"
}

https://github.com/tendermint/starport/blob/103d77dc5b4a97185419e07fba48d85e2c96ee4e/starport/pkg/cosmosfaucet/openapi/openapi.yml.tmpl#L43-L48

[mondainai247]

This requires changing the default values of the config.yml file.