Update stepper.ts

Author: actra-gschuster

src/lib/stepper/stepper.ts

@@ -74,7 +74,7 @@ export class MatStepper extends _MatStepper implements AfterContentInit {
 
   /** Steps that the stepper holds. */
   @ContentChildren(MatStep) _steps: QueryList<MatStep>;
-  
+
   ngAfterContentInit() {
     // Mark the component for change detection whenever the content children query changes
     this._steps.changes.pipe(takeUntil(this._destroyed)).subscribe(() => this._stateChanged());