add Order when cloning board

Signed-off-by: grnd-alt <salimbelakkaf@outlook.de>

lib/Service/BoardService.php

@@ -562,6 +562,11 @@ class BoardService {
 		foreach ($stacks as $stack) {
 			$newStack = new Stack();
 			$newStack->setTitle($stack->getTitle());
+			if ($stack->getOrder() == null) {
+				$newStack->setOrder(999);
+			} else {
+				$newStack->setOrder($stack->getOrder());
+			}
 			$newStack->setBoardId($newBoard->getId());
 			$this->stackMapper->insert($newStack);
 		}