`--no-warp-drive` config when the option isn't used

It seems that generating an app without passing any arguments adds the `--no-warp-drive` option to the ember-cli-update.json file which means any future updates will use the incorrect flags.

This logic seems wrong: https://github.com/ember-cli/ember-app-blueprint/blob/2caac5535e7481287fffba1b228aca187b184636/index.js#L84

Also, do we still want to output the `--no-ember-data` option? I assume we only want `--no-warp-drive` or no option at all at the moment?

Potential fix: https://github.com/ember-cli/ember-app-blueprint/pull/272