fix: account for JudgeAdjust.B offset in UnstableRate display

[Dyrox]

Fixes a calculation error in the Unstable Rate display (introduced in #101)
就是对之前某个社区功能的小修，原来如果在Mods.GameSettings.JudgeAdjust中的B判改变数值，那不会在Unstable Rate那个条上面正确反映，比如说我下面这个视频里即使所有音符几乎都是大P，但显示条显示的还是偏右的粉（我这台机子是B判=-4.0）

BEFORE.mov

现在可以mod可以读取JudgeAdjust里面的B判并自行调整了，（A判不受影响因为只是动画）

AFTER.mov

[gemini-code-assist]

Summary of Changes

Hello @Dyrox, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决不稳定率显示功能中的一个计算错误，确保用户自定义的 B 判调整（JudgeAdjust.B）能够准确地反映在游戏界面上。通过修正这一显示偏差，玩家将获得更精确的视觉反馈，从而提升游戏体验。

Highlights

• 不稳定率显示修复: 修复了不稳定率（Unstable Rate）显示中的计算错误，确保其能正确反映 JudgeAdjust.B 的偏移。
• B判调整反映: 解决了当 Mods.GameSettings.JudgeAdjust 中的 B 判数值改变时，不稳定率显示条无法正确反映该偏移的问题。
• 反射机制应用: 通过反射机制，现在可以正确读取 JudgeAdjust 中的 B 判设置并将其应用于不稳定率的计算，修正了显示偏差。

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[gemini-code-assist]

Code Review

这个 PR 修复了 Unstable Rate 显示中没有正确计算 JudgeAdjust.B 偏移量的问题。通过反射获取 JudgeAdjust 中的私有字段 b 的值，并在计算显示位置时考虑了这个偏移，使得打击点在 Unstable Rate 条上的显示更加准确。

代码改动很直接，逻辑清晰。我只对获取 b 值的反射实现方式有一个小建议，主要是为了提升代码的线程安全性和简洁性。具体请看我的评论。

[Dyrox]

ok搞定

[clansty]

其实应该直接把那个字段设成 public 的。我来改吧