[make:form] fix generated field options_code indentation

[IndraGunawan]

when generating form with EntityType, the indentation of options_code looks wrong

below example is Foo <-- ManyToMany --> Bar
Before

<?php

class BarType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('name')
            ->add('Foo', EntityType::class, [
                'class' => Foo::class,
'choice_label' => 'id',
'multiple' => true,
            ])
        ;
    }

    // ....
}

After

<?php

class BarType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('name')
            ->add('Foo', EntityType::class, [
                'class' => Foo::class,
                'choice_label' => 'id',
                'multiple' => true,
            ])
        ;
    }

    // ....
}

[IndraGunawan]

@jrushlow i also made changes on this as these changes didn't seem right https://github.com/symfony/maker-bundle/pull/1435/files#diff-63196606ee883ed9470b1dfceed2cc28540986c0180afdb82e274812fa4690daR59

using str_contains, it was affect Darwin as well

[jrushlow]

Awesome, Thank you @IndraGunawan