word/edit: crop coordinates separate from convert parameters

word/edit: crop coordinates separate from convert parameters

Move -area value into a distinct image column crop32:

	UPDATE word SET image = jsonb_insert(
		image #- '{convert,0}' #- '{convert,0}',
		'{crop32}', image->'convert'->1
	)
	WHERE image->'convert'->>0 = '-area';

	UPDATE word SET image = jsonb_insert(
		image #- '{convert,2}' #- '{convert,2}',
		'{crop32}', image->'convert'->3
	)
	WHERE image->'convert'->>2 = '-area'
	AND image->'convert'->>0 = '-gravity';

Remaining usage may be influenced by preceding options and need manual
inspection.