대시보드 공용게시판 삭제 오류 수정.

src/main/resources/templates/login/dashboard.html

@@ -13,6 +13,8 @@
 </th:block>
 <div layout:fragment="content">
   <main>
+    <input type="hidden" name="_csrf_header" th:value="${_csrf.headerName}"/>
+    <input type="hidden" th:name="${_csrf.parameterName}" th:value="${_csrf.token}"/>
     <div class="row justify-content-between mx-0 d-none">
       <div class="mb-2">
         <div class="d-inline align-middle"><i class="bi bi-square-fill"></i></div>