Conform tuple support

cfg.conf

# Provide documentation for cfg.settings.login_defaults here.
cfg.settings.login_defaults = {/orange,initiate@example.com}, {/orange/monitor,admin@example.com}

cfg.schema.exs

[
  mappings: [
    "cfg.settings.login_defaults": [
      doc: "Provide documentation for cfg.settings.login_defaults here.",
      to: "cfg.settings.login_defaults",
      datatype: [
        list: :tuple
      ],
      default: [
        {"/orange", "initiate@example.com"},
        {"/orange/monitor", "admin@example.com"}
      ]
    ]
  ],
  translations: [
  ]
]

config.exs

use Mix.Config
config :cfg, :settings, [
  login_defaults: [
    {"/orange", "initiate@example.com"},
    {"/orange/monitor", "admin@example.com"},
  ]
]