ci: use submodules for maa-cli if not in a pull request

The event_name when called by other workflows is not workflow_call,
but the event_name of the workflow that called it.
So we should use github.event_name != 'pull_request' instead.

.github/workflows/publish-sync.yml

@@ -36,8 +36,8 @@ jobs:
           token: ${{ secrets.MAA_HOMEBREW_BUMP_PR }}
           repository: MaaAssistantArknights/MaaAssistantArknights
           ref: dev
-      - name: Update Submodule (Workflow Call)
-        if: github.event_name == 'workflow_call'
+      - name: Update Submodule
+        if: github.event_name != 'pull_request'
         working-directory: src/maa-cli
         run: |
           git submodule init .