Change title bar height (Mica material)

[dongle-the-gadget]

Looks like the height of the Border is wrong (40)

[PRMerger7]

@dongle-the-gadget : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Court72]

@hickeys

Can you review the proposed changes? IMPORTANT: When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"

[prmerger-automator]

@dongle-the-gadget : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 3c74922:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
hub/app-resources/images-tailored-for-scale-theme-contrast.md	⚠️Warning		Details
hub/apps/windows-app-sdk/mrtcore/images-tailored-for-scale-theme-contrast.md	⚠️Warning		Details
hub/apps/design/style/mica.md	✅Succeeded

hub/app-resources/images-tailored-for-scale-theme-contrast.md

• Line 10, Column 1: [Warning: duplicate-h1s - See documentation] H1 'Load images and assets tailored for scale, theme, high contrast, and others' is duplicated with other articles: 'app-resources/images-tailored-for-scale-theme-contrast.md(10,1), apps/windows-app-sdk/mrtcore/images-tailored-for-scale-theme-contrast.md(11,1)'. First level headings must be unique within a docset.

hub/apps/windows-app-sdk/mrtcore/images-tailored-for-scale-theme-contrast.md

• Line 11, Column 1: [Warning: duplicate-h1s - See documentation] H1 'Load images and assets tailored for scale, theme, high contrast, and others' is duplicated with other articles: 'app-resources/images-tailored-for-scale-theme-contrast.md(10,1), apps/windows-app-sdk/mrtcore/images-tailored-for-scale-theme-contrast.md(11,1)'. First level headings must be unique within a docset.

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