Removed useless method call() from callable function. (#5029)

Author: limingxinleo

src/Command.php

@@ -419,7 +419,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $callback = function () {
             try {
                 $this->eventDispatcher && $this->eventDispatcher->dispatch(new Event\BeforeHandle($this));
-                call([$this, 'handle']);
+                $this->handle();
                 $this->eventDispatcher && $this->eventDispatcher->dispatch(new Event\AfterHandle($this));
             } catch (\Throwable $exception) {
                 if (class_exists(ExitException::class) && $exception instanceof ExitException) {