Fix IE event listener issue

The scroll event listener was installed with `node.addEventListener` while removing it is done using the `removeEvent` Chart.js helper. That doesn't work on browsers that don't support the passive option so let's always use the `addEvent` and `removeEvent` Chart.js helpers instead (even if they are deprecated).

Author: simonbrunel

src/plugin.js

@@ -101,7 +101,7 @@ function watch(chart) {
 			stub = parent[STUB_KEY] || (parent[STUB_KEY] = {});
 			charts = stub.charts || (stub.charts = []);
 			if (charts.length === 0) {
-				parent.addEventListener('scroll', onScroll, {passive: true});
+				helpers.addEvent(parent, 'scroll', onScroll);
 			}
 
 			charts.push(chart);