Multiple flag fix (#1742)

* fix

* multiple file logic cleanup

* fix

---------

Co-authored-by: a <a>

src/main/resources/templates/pdf-organizer.html

@@ -18,7 +18,7 @@
               </div>
 
               <form th:action="@{'/api/v1/general/rearrange-pages'}" method="post" enctype="multipart/form-data">
-                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
+                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false, accept='application/pdf')}"></div>
                 <div class="mb-3">
                   <label for="customMode" th:text="#{pdfOrganiser.mode}">Mode</label>
                   <select class="form-control" id="customMode" name="customMode">