Update nightly-cleanup.yml

Author: bertiethorpe

.github/workflows/nightly-cleanup.yml

@@ -1,15 +1,6 @@
 name: Cleanup CI clusters
 on:
   workflow_dispatch:
-      inputs:
-        ci_cloud:
-          description: 'Select the CI_CLOUD'
-          required: true
-          type: choice
-          options:
-            - LEAFCLOUD
-            - SMS
-            - ARCUS
   schedule:
     - cron: '0 21 * * *'  # Run at 9PM - image sync runs at midnight