Fix whitespace in CancelablePromise.hbs

Author: hhelmken

src/templates/core/CancelablePromise.hbs

@@ -83,9 +83,9 @@ export class CancelablePromise<T> implements Promise<T> {
 		});
 	}
 
-	 get [Symbol.toStringTag]() {
-            return "Cancellable Promise";
-     }
+	get [Symbol.toStringTag]() {
+		return "Cancellable Promise";
+	}
 
 	public then<TResult1 = T, TResult2 = never>(
 		onFulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | null,