Carry hatch origin through creation and pattern editing

src/ui/properties.rs

@@ -131,6 +131,7 @@ impl canvas::Program<Message> for HatchPatternPreview {
             }
             HatchPattern::Pattern(_) => {
                 let model = HatchModel {
+                    pattern_origin: None,
                     render_instance: None,
                     world_origin: [0.0, 0.0],
                     boundary: Arc::new(vec![