screencopy-v1: fix logical->physical region transform

This now matches the transformations used for e.g. cursor scissor
regions and damage.

types/wlr_screencopy_v1.c

@@ -542,7 +542,8 @@ static void capture_output(struct wl_client *wl_client,
 
 		buffer_box = *box;
 
-		wlr_box_transform(&buffer_box, &buffer_box, output->transform, ow, oh);
+		wlr_box_transform(&buffer_box, &buffer_box,
+			wlr_output_transform_invert(output->transform), ow, oh);
 		buffer_box.x *= output->scale;
 		buffer_box.y *= output->scale;
 		buffer_box.width *= output->scale;