Fix width check in Image.HandleAtSize.isReusable on Win32

The second condition in isReusable() compared handleContainer.height()
against both height and width due to a copy-paste error. This caused
unnecessary image handle recreation for non-square images. Use
handleContainer.width() for the width comparison.

Author: HeikoKlare

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/graphics/Image.java

@@ -232,7 +232,7 @@ private boolean isReusable(int width, int height) {
 				return false;
 			}
 			return (requestedHeight == height && requestedWidth == width)
-					|| (handleContainer.height() == height && handleContainer.height() == width);
+					|| (handleContainer.height() == height && handleContainer.width() == width);
 		}
 
 		private Optional<InternalImageHandle> createHandleAtExactSize(int width, int height) {