sell: ignore blocked items

sell.py

@@ -25,7 +25,7 @@ def main() -> None:
 	to_sell: dict[str, int] = {}
 	price_limits: dict[str, int] = {}
 	for item in ship_inventory:
-		if item['Type'] == 'SHIPMENT':
+		if item['Type'] in ('SHIPMENT', 'BLOCKED'):
 			continue
 		ticker = item['MaterialTicker']
 		print(f'{item["MaterialAmount"]:5} {ticker:3}:', end=' ')