VIPS + Qualty params not working

[Baltazar5000]

Hello.

This code doesn't work because rokka/imagine-vips doesn't have a quality option, but instead has multiple quality options for each image format.

    filter_sets:
        name:
            quality:              50

This works:

    filter_sets:
        name:
            quality:              50
            jpeg_quality:              50

Quality should work for all VIPS image formats. Please fix. Thank you!

[dbu]

alternatively we could enumerate all format parameters that imagine-vips expects and set each to the quality parameter. that would be consistent with the rest of the configuration.