Fix MouseButton::Other value on Windows (#2565)

This was a mistake in the transition to windows-sys: https://github.com/rust-windowing/winit/pull/2057

We used winapi's GET_XBUTTON_WPARAM before which is using HIWORD instead of LOWORD: https://docs.rs/winapi/0.3.9/src/winapi/um/winuser.rs.html#1297-1299

CHANGELOG.md

@@ -8,6 +8,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 
 # Unreleased
 
+- On Windows, fix the value in `MouseButton::Other`.
 - On macOS, add `WindowExtMacOS::is_document_edited` and `WindowExtMacOS::set_document_edited` APIs.
 - **Breaking:** Removed `WindowBuilderExtIOS::with_root_view_class`; instead, you should use `[[view layer] addSublayer: ...]` to add an instance of the desired layer class (e.g. `CAEAGLLayer` or `CAMetalLayer`). See `vulkano-win` or `wgpu` for examples of this.
 - On MacOS and Windows, add `Window::set_content_protected`.

src/platform_impl/windows/mod.rs

@@ -120,7 +120,7 @@ impl From<u64> for WindowId {
 
 #[inline(always)]
 const fn get_xbutton_wparam(x: u32) -> u16 {
-    loword(x)
+    hiword(x)
 }
 
 #[inline(always)]