Fix previous/next button styles for date picker in dark mode

What does this MR do and why?

Fix previous/next button styles for date picker in dark mode

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before After
image image

How to set up and validate locally

  1. Check out this branch
  2. Ensure you are using dark mode in the GDK
  3. Visit an issue or work item in the GDK
  4. Edit the due date
  5. You will see that the previous/next month buttons are visible.

Related to #480379 (closed)

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