fix: remove redundant devicePixelRatio division in icon scaling

[mhduiy]

The change removes an unnecessary division by devicePixelRatio when scaling icons. The division was redundant because:

1. The image is already being scaled by multiplying with devicePixelRatio in the next line
2. Keeping both operations would effectively cancel each other out
3. This simplifies the logic while maintaining the same visual result

The modification ensures cleaner code without changing the actual behavior, as the final scaled image size remains correct.

fix: 移除图标缩放中多余的 devicePixelRatio 除法操作

本次修改移除了图标缩放过程中多余的 devicePixelRatio 除法运算，因为：

1. 下一行代码已经通过乘以 devicePixelRatio 进行图像缩放
2. 同时保留两个操作会相互抵消效果
3. 简化逻辑的同时保持相同的视觉效果

base64的requestedSize是没有被缩放的原始size，不能除缩放

pms: BUG-304699

Summary by Sourcery

Bug Fixes:

• Remove redundant devicePixelRatio division in icon scaling

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 移除了对 devicePixelRatio 的处理，可能导致在不同设备上显示的图标大小不一致

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: 18202781743, mhduiy

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• debian/deepin/OWNERS

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[sourcery-ai]

Hey @mhduiy - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

Reviewer's Guide

Removed redundant devicePixelRatio division in the icon scaling logic to simplify the implementation while preserving the final image size.

File-Level Changes

Change	Details	Files
Simplify icon size calculation by removing unnecessary division	Deleted the else branch that divided requested icon size by devicePixelRatio Retained direct multiplication of icon_size by devicePixelRatio in the image.scaled call Streamlined conditional logic for clarity	src/private/dquickiconimage.cpp

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