remove 'command' from execute argument

Including the 'command' argument triggers an exception, "Symfony\Component\Console\Exception\InvalidArgumentException : The "command" argument does not exist.", needs to be removed.

Author: aldenw

console.rst

@@ -286,8 +286,6 @@ console::
             $command = $application->find('app:create-user');
             $commandTester = new CommandTester($command);
             $commandTester->execute([
-                'command'  => $command->getName(),
-
                 // pass arguments to the helper
                 'username' => 'Wouter',