Remove empty parameter setting from service-lb

Remove REPLICATION_SERVICE_OPTIONAL_PARAMS parameter from the creation
of the ha-proxy stack, as it is never populated and completely useless
to the service-lb stack.

Change-Id: If69f213e8010bc6ebcf1596d83f2fa45e02c13f4
diff --git a/dual-master/Makefile b/dual-master/Makefile
index 1826b0e..133dabe 100644
--- a/dual-master/Makefile
+++ b/dual-master/Makefile
@@ -255,7 +255,6 @@
 		ParameterKey=TemplateBucketName,ParameterValue=$(TEMPLATE_BUCKET_NAME) \
 		ParameterKey=HAProxyDockerImage,ParameterValue=aws-gerrit/haproxy:$(HAPROXY_HEAD_SHA1) \
 		ParameterKey=SidecarDockerImage,ParameterValue=aws-gerrit/syslog-sidecar:$(SYSLOG_HEAD_SHA1) \
-		$(REPLICATION_SERVICE_OPTIONAL_PARAMS) \
 		$(SERVICE_OPTIONAL_PARAMS)
 
 dns-routing: