FIX: better handling of resizing in stacked charts (#6921)

app/assets/javascripts/admin/components/admin-report-stacked-chart.js.es6

@@ -68,9 +68,9 @@ export default Ember.Component.extend({
     return {
       type: "bar",
       data,
-      responsive: true,
-      maintainAspectRatio: false,
       options: {
+        responsive: true,
+        maintainAspectRatio: false,
         hover: { mode: "index" },
         tooltips: {
           mode: "index",

app/assets/javascripts/admin/templates/components/admin-report-stacked-chart.hbs

@@ -1,3 +1,3 @@
 <div class="chart-canvas-container">
-  <canvas class="chart-canvas" height="250"></canvas>
+  <canvas class="chart-canvas"></canvas>
 </div>