style(material/snack-bar): fix tslint trailing whitespace issue in ci build

Author: nitinmalave

src/material/snack-bar/snack-bar.spec.ts

@@ -543,8 +543,8 @@ describe('MatSnackBar', () => {
     snackBar.open(simpleMessage, simpleActionLabel, { panelClass: ['one', 'two'] });
     viewContainerFixture.detectChanges();
 
-    const containerClasses = 
-        overlayContainerElement.querySelector('snack-bar-container')!.classList;
+    const containerClasses =
+      overlayContainerElement.querySelector('snack-bar-container')!.classList;
 
     expect(containerClasses).toContain('one');
     expect(containerClasses).toContain('two');