[HiveMQ] do not delete /opt/hivemq/temp-extensions in startup command (#5509)

* do not delete /opt/hivemq/temp-extensions in startup command
* command does not get stuck when '/opt/hivemq/temp-extensions' does not exist

Author: Yannick Weber

modules/hivemq/src/main/java/org/testcontainers/hivemq/HiveMQContainer.java

@@ -123,8 +123,7 @@ protected void configure() {
             "-c",
             removeCommand +
             "cp -r '/opt/hivemq/temp-extensions/'* /opt/hivemq/extensions/ " +
-            "; rm -rf /opt/hivemq/temp-extensions/** " +
-            "&& chmod -R 777 /opt/hivemq/extensions " +
+            "; chmod -R 777 /opt/hivemq/extensions " +
             "&& /opt/docker-entrypoint.sh /opt/hivemq/bin/run.sh"
         );
     }