Fix syntax error in orders query

Change "=" for "IN".

FEA: ItEr77S15FilteringEnhancements

libreplan-business/src/main/java/org/libreplan/business/orders/daos/OrderDAO.java

@@ -343,7 +343,7 @@ public class OrderDAO extends IntegrationEntityDAO<Order> implements
             } else {
                 where += "AND ";
             }
-            where += "o.id = :ids ";
+            where += "o.id IN (:ids) ";
         }
 
         strQuery += where;