fix: dropdown header use h6

Author: shuashuai

ui/template/sort-btns.html

@@ -48,9 +48,9 @@
 <div class="dropdown">
   <button type="button" id="react-aria8245013726-:r5:" aria-expanded="false" class="dropdown-toggle btn btn-outline-secondary btn-sm"><i class="br bi-view-stacked"></i></button>
   <div x-placement="bottom-end" aria-labelledby="react-aria8245013726-:r5:" class="dropdown-menu dropdown-menu-end" data-popper-reference-hidden="false" data-popper-escaped="false" data-popper-placement="bottom-end" style="position: absolute; inset: 0px 0px auto auto; transform: translate(0px, 33px);">
-    <div class="dropdown-header" role="heading">
+    <h6 class="dropdown-header" role="heading">
       {{translator ($.language) "ui.btns.view" }}
-    </div>
+    </h6>
     <a aria-selected="true" data-rr-ui-dropdown-item="" class="dropdown-item active" role="button" tabindex="0" href="#" data-footnote-fixed="true">
       {{translator ($.language) "ui.btns.card" }}
     </a>