fix: mark shapeImageThreshold as unitless (#3328)

[Prajwal04M]

What this does

Adds shapeImageThreshold to the unitless CSS properties list.

Why

This prevents Emotion from appending "px" to this CSS property which should always be unitless.

Fixes: #3328

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Let me know if any changes are needed. 🙂

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Latest commit: 0305f07

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