Remove IdeHelperServiceProvider from providers

[Seb33300]

This is to prevent production build to fail when using:

composer install --optimize-autoloader --no-dev
...
In ProviderRepository.php line 208:
  Class "Barryvdh\LaravelIdeHelper\IdeHelperServiceProvider" not found

As I understand IDE Helper Generator for Laravel documentation, you should no force the provider in the config since it is auto discovered:

This package makes use of Laravels package auto-discovery mechanism, which means if you don't install dev dependencies in production, it also won't be loaded.