remove unused param

Author: Josef Harte

src/mas/devops/templates/pipelinerun-update.yml.j2

@@ -139,7 +139,3 @@ spec:
     - name: aiservice_instance_ids
       value: "{{ aiservice_instance_ids }}"
 {%- endif %}
-{%- if aiservice_channel is defined and aiservice_channel != "" %}
-    - name: aiservice_channel
-      value: "{{ aiservice_channel }}"
-{%- endif %}