Fix csrf (#2126)

* apply fix

* Fixes empty th:action

* Update build.gradle

* fix

* formatting

---------

Co-authored-by: Dimitrios Kaitantzidis <james_k23@hotmail.gr>

src/main/resources/templates/remove-image-pdf.html

@@ -20,7 +20,7 @@
                         <span class="material-symbols-rounded tool-header-icon word">remove_selection</span>
                         <span class="tool-header-text" th:text="#{removeImage.header}"></span>
                     </div>
-                        <form action="api/v1/general/remove-image-pdf" method="post" enctype="multipart/form-data">
+                        <form th:action="@{'api/v1/general/remove-image-pdf'}" method="post" enctype="multipart/form-data">
                         <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false, accept='application/pdf')}"></div>
 
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