chore(*): address comments

Author: MonikaKirkova

projects/igniteui-angular/src/lib/combo/combo.common.ts

@@ -1229,7 +1229,7 @@ export abstract class IgxComboBaseDirective implements IgxComboBase, AfterViewCh
             event.stopPropagation();
             this.close();
         }
-        if (event.key === "Tab") {
+        if (event.key === 'Tab') {
             this.close();
         }
     }

projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts

@@ -1239,7 +1239,7 @@ describe('IgxSimpleCombo', () => {
             fixture.detectChanges();
 
             UIInteractions.triggerEventHandlerKeyDown('Escape', dropdownContent);
-            tick()
+            tick();
             fixture.detectChanges();
 
             expect(combo.collapsed).toBeTruthy();