create-stack: fix naming inconsistency in heat-idf.yaml

Change-Id: I7b95dabc28a9ef6df6c4dd30777acf878ea34164
Signed-off-by: Cian Johnston <cian.johnston@est.tech>
diff --git a/playbooks/roles/create-stack/files/heat-idf.yaml b/playbooks/roles/create-stack/files/heat-idf.yaml
index 7b18264..c9ee5f6 100644
--- a/playbooks/roles/create-stack/files/heat-idf.yaml
+++ b/playbooks/roles/create-stack/files/heat-idf.yaml
@@ -30,7 +30,7 @@
         - storage
     hostnames:
       node1: master0
-      node2: node0
+      node2: worker0
       node3: storage0
 
 engine: