[Windows] fixed a bug where title bar's background color was misaligned

[veler]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• New feature or enhancement
• UI change (please include screenshot!)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
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What is the current behavior?

Issue Number: #1228

What is the new behavior?

Other information

Quality check

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• Did you follow the code style guideline as described in CONTRIBUTING.md
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  • Windows
  • macOS
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