fix: attribution class header

[MounirDhahri]

This PR resolves https://www.notion.so/artsy/Extra-padding-or-header-on-the-modals-on-the-artwork-screen-13bcab0764a080e6bd3be0b5be85bbc7?pvs=4

Description

This PR fixes the header on the attribution class screen

Before

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After

PR Checklist

• I have tested my changes on iOS and Android.
• I hid my changes behind a feature flag, or they don't need one.
• I have included screenshots or videos, or I have not changed the UI.
• I have added tests, or my changes don't require any.
• I added an app state migration, or my changes do not require one.
• I have documented any follow-up work that this PR will require, or it does not require any.
• I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

• fix attribution class screen header on new navigation infra - mounir

iOS user-facing changes

Android user-facing changes

Dev changes

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[ArtsyOpenSource]

This PR contains the following changes:

• Cross-platform user-facing changes (fix attribution class screen header on new navigation infra - mounir - MounirDhahri)

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