fix: fix path to property in events (#8116)

The button property points to the wrong path in which it is located in the originalEvent object sent by the client. It seems that it didn't fail before, but lately, that has caused some IT failures, as the mapping from null to int now causes an exception that prevents the Java event objects from being instantiated.

Author: DiegoCardoso

vaadin-charts-flow-parent/vaadin-charts-flow/src/main/java/com/vaadin/flow/component/charts/events/PointLegendItemClickEvent.java

@@ -40,7 +40,7 @@ public PointLegendItemClickEvent(Chart source, boolean fromClient,
             @EventData("event.detail.originalEvent.browserEvent.ctrlKey") boolean ctrlKey,
             @EventData("event.detail.originalEvent.browserEvent.metaKey") boolean metaKey,
             @EventData("event.detail.originalEvent.browserEvent.shiftKey") boolean shiftKey,
-            @EventData("event.detail.originalEvent.button") int button,
+            @EventData("event.detail.originalEvent.browserEvent.button") int button,
             @EventData("event.detail.point.series.index") int seriesIndex,
             @EventData("event.detail.point.category") String category,
             @EventData("event.detail.point.index") int pointIndex,

vaadin-charts-flow-parent/vaadin-charts-flow/src/main/java/com/vaadin/flow/component/charts/events/SeriesLegendItemClickEvent.java

@@ -37,7 +37,7 @@ public SeriesLegendItemClickEvent(Chart source, boolean fromClient,
             @EventData("event.detail.originalEvent.browserEvent.ctrlKey") boolean ctrlKey,
             @EventData("event.detail.originalEvent.browserEvent.metaKey") boolean metaKey,
             @EventData("event.detail.originalEvent.browserEvent.shiftKey") boolean shiftKey,
-            @EventData("event.detail.originalEvent.button") int button,
+            @EventData("event.detail.originalEvent.browserEvent.button") int button,
             @EventData("event.detail.series.index") int seriesIndex) {
         super(source, fromClient);
         this.seriesIndex = seriesIndex;