fix: 调整滑动条横条和刻度颜色

[Whale107]

调整滑动条横条和刻度颜色

Log: 调整滑动条横条和刻度颜色
Bug: https://pms.uniontech.com/bug-view-254295.html
Influence: 调整滑动条横条和刻度颜色

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TAG Bot

New tag: 5.7.1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #605

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TAG Bot

New tag: 5.7.2
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #618

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TAG Bot

New tag: 5.7.3
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #619

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TAG Bot

New tag: 5.7.4
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #623

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TAG Bot

New tag: 5.7.5
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #627

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deepin pr auto review

关键摘要:

• 在DGuiApplicationHelper::adjustColor函数调用中，参数+20可能是一个错误，应该是一个变量或者常量。
• Q_UNUSED(event)宏通常用于避免编译器警告，但在paintEvent函数中，event参数实际上被忽略了，这可能是一个误导。

是否建议立即修改:

• 是

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This pull-request has been approved by: 18202781743, Whale107

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