tiles: don't process images <= tile dimensions

[yashlamba]

Currently we are processing images less than the tile size into pyramidal tiffs, which leads to corrupt files ptif. We would want to skip the processing for those images.

The config design is not the best and I would probably change how we load the default args here:

invenio-rdm-records/invenio_rdm_records/services/iiif/converter.py

Lines 36 to 40 in c387d84

	return (
	self._params
	or current_app.config.get("IIIF_TILES_CONVERTER_PARAMS", {})
	or self.default_params
	)

Probably, completely removing default_args.

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