fix: use the custom error message correctly

[sunnylost]

trafficstars

fix https://github.com/colinhacks/zod/issues/3675

Error messages provided by the user should have the highest priority, so if they exist, they can be used directly.

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[StephanMeijer]

What's the conceptual difference?

[sunnylost]

Under this condition if (iss.code !== "invalid_type"), zod won't display user's custom message.

[LitoMore]

Can you add some tests for this change?