`MOUSE_STATE` enum does not have a `[Flags]` attribute

[Umoxfo]

Actual behavior

UI.Input.MOUSE_STATE enum does not have a [Flags] attribute.

Expected behavior

MOUSE_STATE enum has a [Flags] attribute.

Repro steps

1. NativeMethods.txt content:

MOUSE_STATE

2. NativeMethods.json content (if present): N/A

3. Any of your own code that should be shared? N/A

Context

• CsWin32 version: 0.3.298
• Win32Metadata version (if explicitly set by project): N/A
• Target Framework: net10-windows
• LangVersion (if explicitly set by project): N/A

[Umoxfo]

Essentially, it's the same as #1661 and #1664.