fix(vite-plugin-angular): use defaultMarkdownTemplateTransform if none supplied

[joshuamorony]

PR Checklist

If the markdownTemplateTransforms option is defined, but no transforms are supplied, it will result in broken templates.

What is the new behavior?

If an empty array is supplied for markdownTemplateTransforms it will still use the default transform.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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