[Bug]: Missing an app icon in F-Droid app store

### Prerequisites|前提条件

- [x] I have checked the [troubleshooting](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)|我已经查看过[故障排除](https://github.com/Anxcye/anx-reader/blob/develop/docs/troubleshooting.md)
- [x] I have searched for similar issues and did not find any|我已经搜索过没有相同的问题

### Describe the bug|描述问题

Anx Reader is missing an app icon in F-Droid app store.

### To reproduce|重现步骤

1. Go to F-Droid app store
2. Search Anx Reader
3. See that the Anx Reader app is missing its app icon.

### Expected behavior|预期行为

App icon should be visible in the F-Droid app store.

### Screenshots|截图

Screenshot from F-Droid

### Platform (please complete the following information)|平台（请填写以下信息）

- Platform: | 平台：
Android, Windows...

### Additional context|其他信息

_No response_