[feature] nit: Improve enum template prompts

[jamestalmage]

If type:enum and multiple:false, it shouldn't be two steps to make a choice. Currently it's space to select the choice, enter to submit. That makes sense for multi-select enums (check boxes), but not for single select enumbs (radio buttons).

[milesj]

This isn't an enum specific thing, it's just how the select prompts work in the terminal.