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/misc/adjust-contrast.html

@@ -21,7 +21,7 @@
         <div class="container">
           <div class="row justify-content-center">
             <div class="col-md-12 bg-card">
-              <form>
+              <form th:action="@{''}">
               <div class="row justify-content-center">
 
                 <div class="col-md-3">

src/main/resources/templates/misc/remove-annotations.html

@@ -16,7 +16,7 @@
                 <span class="material-symbols-rounded tool-header-icon other">thread_unread</span>
                 <span class="tool-header-text" th:text="#{removeAnnotations.header}"></span>
               </div>
-              <form id="pdfForm" class="mb-3">
+              <form id="pdfForm" th:action="@{''}" class="mb-3">
                 <div class="custom-file">
                   <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false, accept='application/pdf', remoteCall='false')}"></div>
                 </div>