Accept playbook argument when run is the default app

[nleiva]

ISSUE TYPE

• Feature Idea

SUMMARY

With the following config, I can run the playbook playbook.yml with by only typing ansible-navigator.

ansible-navigator:
  ansible:
    playbook:
      path: playbook.yml
  app: run

If you remove the playbook path from the config, to allow the user to specify another one, this shortcut breaks.

⇨  ansible-navigator playbook.yml
Warning: Issues were found while applying the settings.
   Hint: Command provided: 'playbook.yml'

  Error: argument {subcommand} --help: invalid choice: 'playbook.yml' (choose from 'builder', 'collections', 'config', 'doc',
         'exec', 'images', 'inventory', 'lint', 'replay', 'run', 'settings', 'welcome')

The goal is simple to have a 1-to-1 keyword replacement to ansible-navigator. Yes, I'm lazy. This is super low priority, but wanted to leave here in case we can avoid this CLI check in case the default app is run.

Thanks