Sorting of donation goals by amount doesn't work correctly

# Problem

When the donation goal `hasDirtyAttributes` it gets sorted to the top of the list for some reason. I tried a number of things to fix this but no dice. In particular, I thought the transform would affect it. This seemed to make no difference.

## Subtasks
- [ ] Identify the issue
- [ ] Write a regression test
- [ ] Fix it

先找出捐贈目標清單以及依金額排序目標的程式碼，然後使用 hasDirtyAttributes 為 true 的目標重現此行為。加入所要求的回歸測試，並確認已變更的目標不再移動到頂端，且依金額排序能正確運作。

由索引模型根據 Issue 內容生成。