[MediaBundle] Fix thumbnail image URLs

[jerome2710]

Can we fix the thumbnail image URLs? The macro is currently not spaceless, returning a mark-up. YouTube videos don't have an asset and result in a broken image: https://github.com/Kunstmaan/KunstmaanBundlesCMS/blob/6.x/src/Kunstmaan/MediaBundle/Resources/views/Form/formWidgets.html.twig#L76

Before:

After:

{% set imageUrl = _self.getImageUrl(media, 'media_list_thumbnail')|spaceless %}
{% set retinaImageUrl = _self.getImageUrl(media, 'media_list_thumbnail_retina')|spaceless %}

[tarjei]

@jerome2710 maybe just submit a quick PR for this?

[jerome2710]

@jerome2710 maybe just submit a quick PR for this?

@tarjei, will do! I'm currently on vacation, I'll set a reminder.