align theme variable names for CD ami creation

playbooks/continuous_delivery/create_ami.yml

@@ -21,8 +21,8 @@
 #   - ami_wait                        - (yes/no) should ansible pause while
 #   - no_reboot                       - (yes/no) should the instance not be rebooted during AMI creation
 #   - artifact_path                   - the path to where this ansible run stores the artifacts for the pipeline
-#   - edx_app_theme_repo              - the edx_app_theme repository
-#   - edx_app_theme_version           - the edx_app_theme repository version (git hash)
+#   - edxapp_theme_source_repo        - the edx_app_theme repository
+#   - edxapp_theme_version            - the edx_app_theme repository version (git hash)
 #   - hipchat_token                   - API token to send messages to hipchat
 #   - hipchat_room                    - ID or name of the room to send the notification
 #   - hipchat_url                     - URL of the hipchat API  (defaults to v1 of the api)
@@ -94,8 +94,8 @@
       region: "{{ ec2_region }}"
       resource: "{{ ami_register.image_id }}"
       tags:
-        version:edxapp_theme: "{{ edx_app_theme_repo }} {{ edx_app_theme_version[:7] }}"
-    when: edx_app_theme_version is defined and edx_app_theme_repo is defined
+        version:edxapp_theme: "{{ edxapp_theme_source_repo }} {{ edxapp_theme_version[:7] }}"
+    when: edxapp_theme_version is defined and edxapp_theme_source_repo is defined
 
   - name: Ensure artifact directory exists
     file: