fix: modify the color property of the menuitem hover

[xionglinlin]

Modify the color of the menuitem hover to be the same as AlphabetCategoryPopup

Issue: linuxdeepin/developer-center#8807

[xionglinlin]

/review @BLumia

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在background矩形中使用了DStyle.Style.menu.item.width和DStyle.Style.menu.item.height，建议使用更具体的属性或常量来代替，以提高代码的可读性和可维护性。
• radius属性被设置为1，但没有注释说明原因。如果这是一个临时措施，应该添加一个TODO注释，以便未来的开发者了解这一更改的上下文。
• color: ColorSelector.hoveredPalette使用了ColorSelector的hoveredPalette属性，但没有检查ColorSelector是否已经被正确初始化。
• visible: menuItem.down || menuItem.highlighted表示背景的可见性取决于menuItem的down和highlighted状态。这种逻辑可能不是一成不变的，建议添加注释说明其逻辑。

是否建议立即修改:
是

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, xionglinlin

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[xionglinlin]

/forcemerge

[deepin-bot]

This pr force merged! (status: unstable)