fix(Legend): fix horisontal legend position

Author: ARTer1a

src/hooks/useSeries/prepare-legend.ts

@@ -236,7 +236,7 @@ function getLegendOffset(args: {
         case 'top':
             return {
                 top: chartMargin.top,
-                left: chartMargin.left,
+                left: chartMargin.left + (chartWidth - legendWidth) / 2,
             };
         case 'right':
             return {
@@ -252,7 +252,7 @@ function getLegendOffset(args: {
         default:
             return {
                 top: chartHeight - chartMargin.bottom - legendHeight,
-                left: chartMargin.left,
+                left: chartMargin.left + (chartWidth - legendWidth) / 2,
             };
     }
 }