bug: Fix modal close button storybook example

[ahmadJT]

Description

• [x] updated the close button storybook example so the modal closes on click

Markup:

## Issue https://github.com/epicmaxco/vuestic-ui/issues/3995 ```vue export const CloseButton: StoryFn = () => ({ components: { VaModal }, data () { return { show: false, } }, template: ` show modal Lorem ipsum dolor sit amet consectetur adipisicing elit. Quisquam, voluptatum. Lorem ipsum dolor sit amet consectetur adipisicing elit. Quisquam, voluptatum. `, }) ```

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)