[make:entity] remove empty parenthesis on id

[jrushlow]

To be consistent with other empty columns generated by maker.

e.g.

    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column()]    // () is not needed
    private ?int $id = null;

    #[ORM\Column(length: 255)]
    private ?string $name = null;

    #[ORM\Column]
    private ?int $price = null;