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">