chore(toolbar): Fix failing lint

Author: dkamburov

projects/igniteui-angular/src/lib/grids/grid/grid-toolbar.spec.ts

@@ -402,8 +402,8 @@ describe('IgxGrid - Grid Toolbar #grid', () => {
 
         const button = getColumnPinningButton(fixture);
         expect(button).toBeDefined();
-        const icon = button.nativeElement.querySelector('igx-icon')
-        const iconName = icon.getAttribute("name");
+        const icon = button.nativeElement.querySelector('igx-icon');
+        const iconName = icon.getAttribute('name');
         const btnText = button.nativeElement.innerText.toLowerCase();
         expect(btnText.includes('0') && iconName === 'unpin').toBe(true);
     });