fixed remove buttom visibility

res/forum/admin.html

@@ -9,6 +9,11 @@
 <script>
     let right_panel_buffer = null;
 
+    $(document).ready(function()
+    {
+        $("#remove_btn").hide();
+    });
+
     $.ajax
     ({
         url: "./res/forum/api/list_users.php",
@@ -20,6 +25,7 @@
 
     $("#left_panel").on("click", ".output", function(event)
     {
+        $("#remove_btn").show();
         if (right_panel_buffer == null) right_panel_buffer = document.getElementById("right_panel").innerHTML;
 
         $.ajax