Use foil price if the card in collection is foil

NULL price values were being sorted before cards with prices available.

tutor/database.py

@@ -183,13 +183,16 @@ async def advanced_search(
     ]
     if sort_by == "price":
         orderings = [
-            "CAST(COALESCE(card_prices.usd, card_prices.usd_foil) as decimal) DESC",
+            "CAST(COALESCE(CASE WHEN \"copies\".\"isFoil\" THEN card_prices.usd_foil ELSE card_prices.usd END, 0) as decimal) DESC",
             *orderings,
         ]
     params["last_update_key"] = "last_update"
     query = " ".join(
         [
-            "SELECT cards.*, card_prices.* FROM cards",
+            "SELECT cards.*, card_prices.*",
+            ", CASE WHEN \"copies\".\"isFoil\" THEN card_prices.usd_foil",
+            "       ELSE card_prices.usd END AS usd",
+            "FROM cards",
             " ".join(joins),
             "WHERE" if constraints else "",
             " AND ".join(constraints),
@@ -198,7 +201,7 @@ async def advanced_search(
             f"LIMIT {limit} OFFSET {offset}",
         ]
     )
-    logger.critical("Query: %s", (query, params))
+    logger.debug("Query: %s", (query, params))
     await db.execute(query, params)
     rows = await db.fetchall()