Fix 'potentially malicious URL'

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/resources/templates/bookadd.html

@@ -33,7 +33,7 @@
 
 			<br>
 
-			<a class="btn btn-success" th:href="@{../__${@Pages.LIST}__}"
+			<a class="btn btn-success" th:href="@{__${@Pages.LIST}__}"
 			th:text="${#messages.msgOrNull('button.page.list.return')} ?: 'button.page.list.return'">
 			button.page.list.return
 			</a>