VH should not be in CSS during authoring

[auniverseaway]

Due to AuthorVH outputting data attributes during authoring, we should not have the CSS for VH also being output. The existing pixel based values should still be output.

Expected Behaviour

<!-- editor.html -->
<style>#flex-5c12994e {}</style>

<!-- editor.html -->
<style>#flex-5c12994e {height: 100px}</style>

Actual Behaviour

<!-- editor.html -->
<style>#flex-5c12994e {height:60vh}</style>

<!-- editor.html -->
<style>#flex-5c12994e {height: 100px}</style>