Fix the problem of not displaying while configuring ICP only (#196)

```release-note
修复只填写了 ICP 备案号时不显示的问题
```

templates/modules/footer.html

@@ -36,7 +36,7 @@
   <div class="space-y-1">
     <span
       class="mx-auto block max-w-7xl px-4 text-center text-sm text-gray-500 dark:text-slate-300 lg:px-6"
-      th:if="${not #strings.isEmpty(theme.config.beian.gongan_text)}"
+      th:if="${not #strings.isEmpty(theme.config.beian.icp_text)}"
     >
       <a
         href="https://beian.miit.gov.cn/"
@@ -155,7 +155,7 @@
       <div class="flex flex-col gap-1 sm:flex-row">
         <span
           class="block text-center text-sm text-gray-500 sm:text-left"
-          th:if="${not #strings.isEmpty(theme.config.beian.gongan_text)}"
+          th:if="${not #strings.isEmpty(theme.config.beian.icp_text)}"
         >
           <a
             href="https://beian.miit.gov.cn/"