BUGFIX #3671: add check if custom ratios for images are allowed

[NicoleNitschke]

What I did
I prevent the clear button in the image cropper view to appear, if the yaml-configuration says allowCostum: false. This way, we show only allowed aspect ratios.

How I did it
I changed the code, so that the yaml settings 'allowCustom' for the image editor is respected.

How to verify it
As described in the issue:
Configure a property with an image, forcing the editor to crop the image to one of the provided aspect-ratios.

  properties:
    image:
      type: Neos\Media\Domain\Model\ImageInterface
      ui:
        inspector:
          group: 'media'
          position: 50
          editorOptions:
            crop:
              aspectRatio:
                # we want to force an aspect-ratio when selecting the image
                forceCrop: true
                # we explicitely don't want custom aspect-ratios
                allowCustom: false
                # we set a defaultOption so we don't end up without selected aspect-ratio
                defaultOption: portrait
                options:
                  portrait:
                    label: Portrait
                    width: 2
                    height: 3
                  landscape:
                    label: Landscape
                    width: 3
                    height: 2

Before:

With bugfix:

[grebaldi]

Hi @NicoleNitschke.

this makes sense indeed. I was able to verify that your change works like a charm! 👍 Thanks a lot for your work! :)