🐛 Fix: 修复头部图片展示问题

Author: xzhuz

templates/post.html

@@ -20,7 +20,7 @@
           />
         </div>
         <div
-          th:if="${#strings.isEmpty(post.spec.cover)} and ${theme.config.general.enabled_card_random_cover_list}"
+          th:if="${not #strings.isEmpty(post.spec.cover)} or ${theme.config.general.enabled_card_random_cover_list}"
           class="cover-bg absolute bottom-0 left-0 right-0 top-0 opacity-30"
         >
           <img
@@ -30,7 +30,7 @@
           />
         </div>
         <div
-          th:unless="${not #strings.isEmpty(post.spec.cover)} or ${theme.config.general.enabled_card_random_cover_list}"
+          th:if="${#strings.isEmpty(post.spec.cover)} and ${!theme.config.general.enabled_card_random_cover_list}"
           class="placeholder-bg"
         ></div>
         <div