Fix a column name for the customers schema in the jaffle example

[gliga]

Resolves #

It would be an overkill for this change.

Problem

This PR fixes a typo in the jaffle example: one column was not named properly in the schema.

Solution

Update the name to match the one in the sql.

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

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[gliga]

In the message by the bot "above above" should be changed to "above".

[gliga]

Signed ClA