Remove typo

Co-authored-by: Zdravko Kolev <[email protected]>

Author: pmoleri

NorthwindCRUD/Controllers/QueryBuilderController.cs

@@ -67,7 +67,7 @@ public ActionResult<QueryBuilderResult> ExecuteQuery(Query query)
                     "orderdetails" => dataContext.OrderDetails.Run<OrderDetailDb, OrderDetailDto>(query, mapper),
                     "shippers" => dataContext.Shippers.Run<ShipperDb, ShipperDto>(query, mapper),
                     "suppliers" => dataContext.Suppliers.Run<SupplierDb, SupplierDto>(query, mapper),
-                    _ => throw new InvalidOperationException($"Unknown entity ${t}"),
+                    _ => throw new InvalidOperationException($"Unknown entity {t}"),
                 }
             },
         });