another sed command fix

Author: timidri

.github/workflows/test-failover.yaml

@@ -175,7 +175,7 @@ jobs:
 
       - name: 'Swap primary and replica nodes in inventory'
         run: |
-          sed -i .sedbak 's/role: primary$/role: failed/;s/primary/__tmp__/;s/spare-replica/__tmp2__/;s/replica/primary/;s/__tmp__/replica/;s/__tmp2__/replica/' \
+          sed -i.sedbak 's/role: primary$/role: failed/;s/primary/__tmp__/;s/spare-replica/__tmp2__/;s/replica/primary/;s/__tmp__/replica/;s/__tmp2__/replica/' \
               spec/fixtures/litmus_inventory.yaml
 
       - name: 'Upgrade PE on test cluster'