Fix one bug of the macOS API `SDScaledImageForKey`, which does not modify the bitmapImageRep's size when scale is not equal to 1

SDWebImage/SDWebImageDefine.m

@@ -98,6 +98,7 @@ inline UIImage * _Nullable SDScaledImageForScaleFactor(CGFloat scale, UIImage *
         if (bitmapImageRep) {
             NSSize size = NSMakeSize(image.size.width / scale, image.size.height / scale);
             animatedImage = [[NSImage alloc] initWithSize:size];
+            bitmapImageRep.size = size;
             [animatedImage addRepresentation:bitmapImageRep];
         }
 #endif