Key combination on macOS interferes with func CLI

I was just scaffolding out a project with `func init` and then `func new`, and in both steps noticed that I'd somehow backspaced the prompt text the CLI output both in "Choose Option" and "Function name":


After a few more tries, I realized that there was an easy to reproduce way to achieve this:

- Type up to three characters
- Press `Option` and `Backspace`
- Nothing should happen
- Start pressing backspace
- You should be able to backspace the characters the CLI output

Reproduce the issue on macOS with `func init` and `func new`, following the Option-Backspace steps in the report. Start by tracing the CLI prompt handling for the “Choose Option” and “Function name” prompts; done means Option-Backspace leaves the prompt text unchanged while normal Backspace still removes typed characters.

Written by the indexing model from the issue text.