fix: guest upload

theme/onemoe.html

@@ -140,10 +140,10 @@
 <!--EncryptedEnd-->
 <!--GuestUploadStart-->
                 <div id="upload_div" style="margin:10px">
-                <center>
+                    <div id="upload_btns" align="center">
                     <input id="upload_file" type="file" name="upload_filename">
                     <input id="upload_submit" onclick="preup();" value="<!--constStr@Upload-->" type="button">
-                <center>
+                    </div>
                 </div>
 <!--GuestUploadEnd-->