Environment

• OS: [e.g. macOS, Windows]: macOS
• Node Version: [e.g. v18.14.0]: v10.9.1
• Package: [e.g. @clack/prompts, @clack/core]: @clack/prompts": "^0.6.3",

Describe the bug
A clear and concise description of what the bug is.
When adding initiailValue for promptText there's a trailing underscore which seems to be a cursor; this leads to confusing experience, especially if we already have an underscore in the text

To Reproduce
Include a link to a minimal reproduction using node.new

const name = await promptText({
    message:
      "What's the secret name?",
    initialValue: 'MY_TOP_SECRET',
  });

Results in:

Steps to reproduce the behavior:

• Include reproduction steps

Expected behavior
A clear and concise description of what you expected to happen.
There should be no underscore that acts like a cursor. Just the cursor should be displayed.

Additional Information
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