fix(Bar): revert the strokeFirst to stroke null following the reviewe…

…d changes

src/chart/bar/BarView.ts

@@ -1177,7 +1177,7 @@ function createLarge(
     group.add(el);
     el.useStyle(data.getVisual('style'));
     // Stroke is rendered first to avoid overlapping with fill
-    el.style.strokeFirst = true;
+    el.style.stroke = null;
     // Enable tooltip and user mouse/touch event handlers.
     getECData(el).seriesIndex = seriesModel.seriesIndex;