Fix D3 type issue

Author: ghillert

ui/src/app/analytics/charts/bubble-chart/bubble-chart.component.ts

@@ -140,7 +140,11 @@ export class BubbleChartComponent implements OnInit, OnChanges {
         return b.value - a.value;
       });
 
-      const colors = d3.schemeCategory20c;
+      /**
+       * 'schemeCategory20c' does not exist in the type definition file but does
+       * in D3 itself.
+       */
+      const colors = (<any> d3).schemeCategory20c;
 
       const bubble = d3.pack()
         .size([widthToUse, heightToUse])

ui/src/app/analytics/charts/pie-chart/pie-chart.component.ts

@@ -202,7 +202,11 @@ export class PieChartComponent implements OnInit, OnChanges {
       return b.value - a.value;
     });
 
-    const colors = d3.schemeCategory20c;
+    /**
+     * 'schemeCategory20c' does not exist in the type definition file but does
+     * in D3 itself.
+     */
+    const colors = (<any> d3).schemeCategory20c;
 
     const pie = d3.pie()
       .sort(null)