RFR: 8365708: Add missing @Override annotations to WindowsMenuItemUIAccessor

[Sergey Bylokhov]

On Mon, 18 Aug 2025 16:49:48 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Add the missing `@Override` annotations to anonymous classes implementing `WindowsMenuItemUIAccessor`.
> 
> PR #24170 for [JDK-8352638](https://bugs.openjdk.org/browse/JDK-8352638) added the `@Override` annotations to `getMenuItem` and `getPart` but left `getState` without the annotation.
> 
> For consistency, add the annotation to the `getState` method too.

src/java.desktop/windows/classes/com/sun/java/swing/plaf/windows/WindowsCheckBoxMenuItemUI.java line 55:

> 53:             }
> 54: 
> 55:             @Override

There is the new paintMenuItem method below which can be annotated as well.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26828#discussion_r2282991338