[DarkMode] Button with FlatStyle.Popup does not show hover state in Dark Mode

### .NET version

10.0.100-rc.2.25466.103

### Did it work in .NET Framework?

Not tested/verified

### Did it work in any of the earlier releases of .NET Core or .NET 5+?

DarkMode is a new feature in .NET 10

### Issue description

In Windows Forms, when a Button control has its FlatStyle set to FlatStyle.Popup, it does not show any visual feedback (such as border change) when the mouse hovers over it under Dark Mode. This breaks expected UI behavior and provides no indication of interactivity.

**Dark mode:** has a problem

https://github.com/user-attachments/assets/0d9ebb44-a7cc-4a61-b185-54ebab1dd536

**Classic mode:** work well

https://github.com/user-attachments/assets/22ecd343-4602-4aa4-b07f-3a4b6360b686

### Steps to reproduce

1. Create a new Windows Forms application
2. Add a Button control to the form
3. Set button1.FlatStyle = FlatStyle.Popup
4. Set app under Dark mode in program.cs file:
`Application.SetColorMode(SystemColorMode.Dark);`
5. Run the application
6. Hover the mouse over the button to observe