[PROD-30068] Fix invalid Haproxy configuration

Fix invalid class name for Haproxy large setup

Change-Id: I09926d03adeae1e2e046d5195b0bbef49a43c25c
(cherry picked from commit 55bdb84372c22500cc46c15d99c99847bbaee8bc)
diff --git a/haproxy/proxy/listen/openstack/large_setup.yml b/haproxy/proxy/listen/openstack/large_setup.yml
index 947cfce..c517779 100644
--- a/haproxy/proxy/listen/openstack/large_setup.yml
+++ b/haproxy/proxy/listen/openstack/large_setup.yml
@@ -8,4 +8,4 @@
 - system.haproxy.proxy.listen.openstack.keystone.large
 - system.haproxy.proxy.listen.openstack.neutron_large
 - system.haproxy.proxy.listen.openstack.nova_large
-- system.haproxy.proxy.listen.openstack.novanc_large
+- system.haproxy.proxy.listen.openstack.novnc_large