fix(sketch): remove autoapplied gray borders from sketch package

[emyarod]

Closes #6922

This PR prevents the Sketch/DOM JS package from applying border styles to the icon symbols when the Carbon sketch plugin runs sync commands

Changelog

Changed

• clear default border styles from Sketch JS package

Removed

• unused border style resets

Testing / Reviewing

1. Run icon sync command(s) in Sketch plugin (updated build attached below)
2. Run the sync command again (or a different sync command)
3. Observe that no gray border styles are added to every icon symbol

carbon-elements.sketchplugin.zip

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[andreancardona]

🌮 yay!!

[laurenmrice]

I downloaded the newest plugin build. I am not seeing a gray border added to icons. Yay! 🎉These are the different ways I tested it:

✅ Syncing command to our existing icon sketch libraries (tested all sizes)
✅ Running the command in a brand new document (tested all sizes)