IIIF: config changes

[dfdan]

❤️ Thank you for your contribution!

Description

A couple of minor tweaks to IIIF configuration.

I'm sure someoen will have a better way to make sure that RECORDS_RESOURCES_IMAGE_FORMATS and IIIF_FORMATS agree, I will mark this as a draft and welcome comments.

requires invenio-records-resources#484

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[slint]

LGTM!

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