FIX: typo in block.json schema default scope values

[jeremylind]

The accepted scope value is inserter, not inseter

What?

Fixing a typo

Why?

Use an accepted default value for scope.

How?

Fixes the typo.

Testing Instructions

While editing in a text editor that uses $schema context, add a scope attribute to a variation.

Screenshots or screencast

[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @jeremylind! In case you missed it, we'd love to have you join us in our Slack community, where we hold regularly weekly meetings open to anyone to coordinate with each other.

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[ajlende]

Looks good! Thanks! 👍

[github-actions]

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