fix: add symbolPath opacity. close #21074

Author: mustcanbedo

src/chart/radar/RadarView.ts

@@ -232,7 +232,8 @@ class RadarView extends ChartView {
                         // TODO other properties like x, y ?
                         image: pathStyle.image,
                         x: pathStyle.x, y: pathStyle.y,
-                        width: pathStyle.width, height: pathStyle.height
+                        width: pathStyle.width, height: pathStyle.height,
+                        opacity: 0.7,
                     }, itemStyle));
                 }
                 else {