chore: update problem statement code (#1444)

Author: Mimo-07

apps/angular/13-highly-customizable-css/src/app/text.component.ts

@@ -4,7 +4,7 @@ import { Component, input } from '@angular/core';
 @Component({
   selector: 'text',
   template: `
-    <p style="font-size: {{ font }}px; color: {{ color }}">
+    <p style="font-size: {{ font() }}px; color: {{ color() }}">
       <ng-content />
     </p>
   `,