Change spread order to get deep merge

[sistrall]

Fixes an issue due to the wrong order in merging custom stores configuration: in case only a subset of the standard store is customized, the names of the remaining ones get lost.

To help everyone out, please make sure your PR does the following:

• Update the first line to point to the ticket that this PR fixes
• Add a message that clearly describes the fix
• If applicable, add a test that would fail without this fix
• Make sure the unit and integration tests pass locally with pnpm run tests and cd integration && pnpm run tests
• Includes a changeset if your fix affects the user with pnpm changeset

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4f85082

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[vercel]

@sistrall is attempting to deploy a commit to the HoudiniGraphQL Team on Vercel.

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[AlecAivazis]

whoops!! Good catch 👍 mind adding a changeset?

[vercel]

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Name	Status	Preview	Comments	Updated
docs	❌ Failed (Inspect)			Jan 19, 2023 at 8:34PM (UTC)

[vercel]

Deployment failed with the following error:

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[sistrall]

@AlecAivazis I'd like to complete the checklist, sure, but I got issues with pnpm i: it seems turbo is not installed on my machine or something like that. As soon as I move on, I'll add the changeset.

[AlecAivazis]

Hey @sistrall! Mind changing the target of your PR to the next branch?

[AlecAivazis]

I'm just going to merge this in - don't worry about the changeset