bug(list): list item with activated state miss background color

### Is this a regression?

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

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

_No response_

### Description

Hi there,
When using `mat-nav-list` with items that have an activated state, the primary color is applied on the activated item but the background color is missing.

### Reproduction

https://stackblitz.com/edit/angular-aovyvr

### Expected Behavior

Having same behavior than : https://material-components.github.io/material-components-web-catalog/#/component/list

(Scroll to "List with activated item" section and click on any list item)

### Actual Behavior

Only the font color is applied

### Environment

- Angular: 15.2.6
- CDK/Material: 15.2.6
- Browser(s): Chrome 112
- Operating System (e.g. Windows, macOS, Ubuntu): Any

リンク先の StackBlitz の再現から始め、mat-nav-list の activated-state スタイルを確認します。リンク先の Material Components のリスト例と比較し、activated item に期待される背景色と primary text color の両方が表示されることを確認します。

索引モデルが issue の本文から書いたものです。