Fix broken link to websession-broker

Local environment could not be setup because of a broken link when
fetching the websession-broker artifact.

The artifact is built against its own branch and not against master.

Change-Id: I315636b6accb87538423d93a5c975efe9b87fcae
diff --git a/setup_local_env/setup.sh b/setup_local_env/setup.sh
index 84037ad..3fc198e 100755
--- a/setup_local_env/setup.sh
+++ b/setup_local_env/setup.sh
@@ -341,7 +341,7 @@
 fi
 if [ $DOWNLOAD_WEBSESSION_PLUGIN = "true" ];then
   echo "Downloading websession-broker plugin $GERRIT_BRANCH"
-  wget $GERRIT_CI/plugin-websession-broker-bazel-master-$GERRIT_BRANCH/$LAST_BUILD/websession-broker/websession-broker.jar \
+  wget $GERRIT_CI/plugin-websession-broker-bazel-$GERRIT_BRANCH/$LAST_BUILD/websession-broker/websession-broker.jar \
   -O $DEPLOYMENT_LOCATION/websession-broker.jar || { echo >&2 "Cannot download websession-broker plugin: Check internet connection. Abort\
 ing"; exit 1; }
   wget $GERRIT_CI/plugin-healthcheck-bazel-$GERRIT_BRANCH/$LAST_BUILD/healthcheck/healthcheck.jar \