Merge pull request #4411 from shreyashah115/heatmap_fix

[Fix] HeatMap on Activity page

frappe/desk/page/activity/activity.js

@@ -180,8 +180,9 @@ frappe.activity.render_heatmap = function(page) {
 		method: "frappe.desk.page.activity.activity.get_heatmap_data",
 		callback: function(r) {
 			if(r.message) {
-				var heatmap = new frappe.ui.HeatMap({
-					parent: $(".heatmap"),
+				var heatmap = new Chart({
+					parent: ".heatmap",
+					type: 'heatmap',
 					height: 100,
 					start: new Date(moment().subtract(1, 'year').toDate()),
 					count_label: "actions",