add missing app_name

Author: abrulic

.github/workflows/pr-close.yml

@@ -24,4 +24,4 @@ jobs:
           FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
           FLY_ORG: ${{ vars.FLY_ORG }}
         with:
-          ${{github.event.repository.name}}-${{ github.event.number }}
+          app_name: ${{github.event.repository.name}}-${{ github.event.number }}