bug(material/table): Row of sticky column is transparent on hover in custom dark theme

### Is this a regression?

- [X] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

14.2.7

### Description


https://stackblitz.com/edit/angular-nhbxgc?file=src/app/table-sticky-columns-example.html

### Reproduction

Steps to reproduce:
1. Custom material dark theme is applied
2. In table that has a sticky column, try horizontal scrolling.
3. The hover row in the sticky column is transparent so other columns show beneath it.

### Expected Behavior

I expect the hovered row of the sticky column to not be transparent in a custom dark theme.

### Actual Behavior

The hovered row of the sticky column is transparent in a custom dark theme.

### Environment

- Angular: 15.2.1
- CDK/Material: 15.2.1
- Browser(s): Chrome, Firefox
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

リンクされた StackBlitz の再現を実行し、src/app/table-sticky-columns-example.html から始めて、カスタムダークテーマの sticky-column table に注目してください。水平方向にスクロールして行にカーソルを合わせ、問題を再現します。Chrome と Firefox で、ホバーした行の sticky column が不透明になり、下にある列が透けて見えなくなれば完了です。

索引モデルが issue の本文から書いたものです。