style: fix hover contrast on datepicker

[pierrealexandre2]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots:

Before (If applicable):

After:

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation update
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Other... Please describe:

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.64%. Comparing base (86bfd4d) to head (9f4e885).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1685 +/- ## ========================================== - Coverage 94.69% 94.64% -0.05% ========================================== Files 134 134 Lines 19482 19482 Branches 3055 3054 -1 ========================================== - Hits 18448 18439 -9 - Misses 1034 1043 +9 ```

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