AoCheckbox: emits Boolean rather than assigned value

# Issue summary

When setting the `checkboxValue` prop to an object, selecting the checkbox emits `true` rather than the assigned value.

## Expected behavior

The 'input' emit should pass the Number/Object/Array privided by the checkboxValue prop

## Actual behavior

The 'input' emit always passes a Boolean

## Steps to reproduce the problem

1. Add an ao-checkbox with the `:checkbox-value` prop set to an Object or Number
1. Click the checkbox