Fetch full board data after cloning

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Service/BoardService.php

@@ -677,7 +677,7 @@ class BoardService {
 			$this->stackMapper->insert($newStack);
 		}
 
-		return $newBoard;
+		return $this->find($newBoard->getId());
 	}
 
 	public function transferBoardOwnership(int $boardId, string $newOwner, bool $changeContent = false): Board {