Minor refactoring in WebAsyncManager

There is no need to set the DeferredResult from WebAsyncManager in an
onError notification because it is already done from the Lifecycle
interceptor in DeferredResult.

See gh-34192

spring-web/src/main/java/org/springframework/web/context/request/async/WebAsyncManager.java

@@ -438,10 +438,7 @@ public final class WebAsyncManager {
 				logger.debug("Servlet container error notification for " + formatUri(this.asyncWebRequest));
 			}
 			try {
-				if (!interceptorChain.triggerAfterError(this.asyncWebRequest, deferredResult, ex)) {
-					return;
-				}
-				deferredResult.setErrorResult(ex);
+				interceptorChain.triggerAfterError(this.asyncWebRequest, deferredResult, ex);
 			}
 			catch (Throwable interceptorEx) {
 				setConcurrentResultAndDispatch(interceptorEx);