refactored out dependency

src/engine/db/handlers/dbContractHandler.java

@@ -135,7 +135,7 @@ public class dbContractHandler extends dbHandlerBase {
             preparedStatement.setInt(5, (con.getVendorDialog() != null) ? con.getVendorDialog().getObjectUUID() : 0);
             preparedStatement.setInt(6, con.getIconID());
             preparedStatement.setInt(8, con.getObjectUUID());
-            preparedStatement.setLong(7, con.getAllowedBuildings().toLong());
+            preparedStatement.setLong(7, mbEnums.toLong(con.getAllowedBuildings()));
 
             return (preparedStatement.executeUpdate() > 0);