fix chart demo. add DecimalPipe

Author: GoodDayForSurf

apps/demos/Demos/Charts/TooltipCustomization/Angular/app/app.component.ts

@@ -1,5 +1,6 @@
 import { bootstrapApplication } from '@angular/platform-browser';
 import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core';
+import { DecimalPipe } from '@angular/common';
 import { DxPieChartModule } from 'devextreme-angular';
 import { Service, State } from './app.service';
 
@@ -20,6 +21,7 @@ if (window && window.config?.packageConfigPaths) {
   styleUrls: [`.${modulePrefix}/app.component.css`],
   imports: [
     DxPieChartModule,
+    DecimalPipe,
   ],
 })
 export class AppComponent {