[ImageResizer][Accessibility] Fix combo box text color

[stefansjfw]

Summary of the Pull Request

Light before

Light theme after

Dark theme before

Dark theme after

PR Checklist

• Closes: [Power Toys-Image resizer]: The color contrast ratio for the texts 'fits in' and 'pixel' is less than expected 4.5:1 ratio. #32263
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

Tested with Colour contrast analyzer tool. Contrast is now 12.4:1 for light theme and 12.1:1 for dark theme.

[niels9001]

Isn't TextFillColorPrimaryBrush the default? I think it can be omitted

Yeah agreed, added that as comments.

[stefansjfw]

Isn't TextFillColorPrimaryBrush the default? I think it can be omitted

Yeah agreed, added that as comments.

Merged commit suggestions. Thanks

[jaimecbernardo]

LGTM! Thank you!

Niels suggestions have been commited as-is

[jaimecbernardo]

/azp run

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