Logging function does not correctly log the first choice in menus

[Spiky Caterpillar]

When logging, all menu choices except the first will have 'Choice: ' prepended.

To fix so that all choices have Choice: prepended, change the relevant bit in renpy.exports.display_menu() to:

    # Log the chosen choice.
    for label, val in items:
        if val is not None:
            log("Choice: " + label)
        else:
            log(label)

[Tom Rothamel (renpytom)]

Took the fix for 6.13.9.

Thank you.