fix cmdq

src/main/java/at/acdp/urweb/URBot.java

@@ -37,10 +37,10 @@ public class URBot {
         Thread queueThread = new Thread(() -> {
             try {
                 while (true) {
+                    cmdDoneSem.acquire();
                     var c = cmdq.take();
                     sc.writeCmd(c);
                     while (true) {
-                        cmdDoneSem.acquire();
                         if (currentAck.id == c.id && currentAck.message.equals("URWEB_END")) {
                             if (c.cpeeCallback != null) {
                                 ackCPEE(c);