Revert to destroying the model after use

Change-Id: I74d5897ab3a54e974c1b940952cf2ee9ad670260
diff --git a/playbooks/charm-cinder-storpool-iscsi/zaza-functional.yaml b/playbooks/charm-cinder-storpool-iscsi/zaza-functional.yaml
index 3a1a4c2..8b6a4f8 100644
--- a/playbooks/charm-cinder-storpool-iscsi/zaza-functional.yaml
+++ b/playbooks/charm-cinder-storpool-iscsi/zaza-functional.yaml
@@ -26,7 +26,7 @@
             chdir: /home/ubuntu/src/spfactory.storpool.com/charm-cinder-storpool-iscsi
 
         - name: run func-target-discard-model
-          ansible.builtin.shell: tox -e func-target {{ bundle }}
+          ansible.builtin.shell: tox -e func-target-discard-model {{ bundle }}
           args:
             executable: /usr/bin/bash
             chdir: /home/ubuntu/src/spfactory.storpool.com/charm-cinder-storpool-iscsi