fix(tabs): replace igx-icon with igc-icon in WC demo + fix theme parameters

src/app/tabs-showcase/tabs-showcase.sample.html

@@ -32,7 +32,7 @@
             @for (contact of contacts; track contact.id) {
                 <igc-tab [selected]="contact.id === selectedTabId">
                     @if(!properties.hideIcon) {
-                        <igx-icon slot="label">folder</igx-icon>
+                        <igc-icon name="folder" slot="label"></igc-icon>
                     }
                     @if(!properties.hideText) {
                     <span slot="label">{{ contact.text }}</span>

src/app/tabs-showcase/tabs-showcase.sample.ts

@@ -20,13 +20,20 @@ import {
     defineComponents,
     IgcTabsComponent,
     IgcTabComponent,
+    IgcIconComponent,
+    registerIconFromText
 } from 'igniteui-webcomponents';
 import {
     PropertyChangeService,
     Properties,
 } from '../properties-panel/property-change.service';
 
-defineComponents(IgcTabsComponent, IgcTabComponent);
+defineComponents(IgcTabsComponent, IgcTabComponent, IgcIconComponent);
+
+registerIconFromText(
+    'folder',
+    '<svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 -960 960 960" width="24px"><path d="M160-160q-33 0-56.5-23.5T80-240v-480q0-33 23.5-56.5T160-800h240l80 80h320q33 0 56.5 23.5T880-640v400q0 33-23.5 56.5T800-160H160Z"/></svg>'
+);
 
 @Component({
     selector: 'app-tabs-showcase-sample',