cleanup and defaults

src/main/resources/templates/security/add-watermark.html

@@ -13,7 +13,7 @@
                     <div class="col-md-6">
                         <h2 th:text="#{watermark.header}"></h2>
 
-                        <form method="post" enctype="multipart/form-data" action="add-watermark">
+                        <form method="post" enctype="multipart/form-data" action="api/v1/security/add-watermark">
                             <div class="mb-3">
                                 <label th:text="#{watermark.selectText.1}"></label>
                                 <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}">