fix: allow outpainting a source_processing type
#497
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outpaintingis allowed as asource_processingvalue, but prior to this change users who set this value will end up causing a 500 stemming from asqlalchemy.exc.DataError: (psycopg2.errors.StringDataRightTruncation) value too long for type character varying(10)error.This change allows the intended number of characters, plus an extra one for posterity, reinstating outpainting as a valid image processing mode. Hordelib has always supported this value - users would be able to start inpainting today as soon as the SQL script is run.