Minor fix in start-broker.bat

Signed-off-by: Daniel Dylag <bisker@op.pl>

Author: Bisk1

start-broker.bat

@@ -1,10 +1,11 @@
 @echo off
 rem Simplified Windows version of start-broker.sh
 rem Moquitto broker not supported, only Python Interopability Broker
-rem echo "Installing and starting Python Interop Broker."
+echo "Installing and starting Python Interop Broker."
 if not exist "paho.mqtt.testing" (
 	git clone https://github.com/eclipse/paho.mqtt.testing.git
 )
 copy "java_client_testing.conf" "paho.mqtt.testing/interoperability/java_client_testing.conf" /y
 cd paho.mqtt.testing/interoperability
-start python3 startbroker.py -c java_client_testing.conf
+start python3 startbroker.py -c java_client_testing.conf
+cd ../..