test(material/stepper): fix ci build fail issue

Author: nitinmalave

src/material/stepper/stepper.spec.ts

@@ -259,7 +259,8 @@ describe('MatStepper', () => {
     it('should not set focus on header of selected step if header is not clicked', () => {
       const stepperComponent =
           fixture.debugElement.query(By.directive(MatStepper))!.componentInstance;
-      const stepHeaderEl = fixture.debugElement.queryAll(By.css('mat-step-header'))[1].nativeElement;
+      const stepHeaderEl =
+          fixture.debugElement.queryAll(By.css('mat-step-header'))[1].nativeElement;
       const nextButtonNativeEl = fixture.debugElement
           .queryAll(By.directive(MatStepperNext))[0].nativeElement;
       spyOn(stepHeaderEl, 'focus');
@@ -273,7 +274,8 @@ describe('MatStepper', () => {
     it('should focus next step header if focus is inside the stepper', () => {
       const stepperComponent =
           fixture.debugElement.query(By.directive(MatStepper))!.componentInstance;
-      const stepHeaderEl = fixture.debugElement.queryAll(By.css('mat-step-header'))[1].nativeElement;
+      const stepHeaderEl =
+          fixture.debugElement.queryAll(By.css('mat-step-header'))[1].nativeElement;
       const nextButtonNativeEl = fixture.debugElement
           .queryAll(By.directive(MatStepperNext))[0].nativeElement;
       spyOn(stepHeaderEl, 'focus');
@@ -839,7 +841,7 @@ describe('MatStepper', () => {
     it('should be able to use the legacy classes in queries', () => {
       const fixture = createComponent(SimpleMatVerticalStepperApp);
       fixture.detectChanges();
-      
+
       expect(fixture.componentInstance.legacyTokenStepper).toBeTruthy();
     });