fixed delete buttons

Author: Taz03

application/src/main/java/org/togetherjava/tjbot/features/mathcommands/TeXCommand.java

@@ -170,6 +170,7 @@ public void onButtonClick(final ButtonInteractionEvent event, final List<String>
                 .queue();
             return;
         }
-        event.getMessage().delete().queue();
+        event.deferReply().queue();
+        event.getHook().deleteOriginal().queue();
     }
 }