Scan-secrets: Fix PR forcepush detection condition

I have no idea why the `event_name` != `github.event.action`, but in
this case it doesn't.  For consistency with other related condition
checks, use the later over the former.

Signed-off-by: Chris Evich <cevich@redhat.com>

.github/workflows/scan-secrets.yml

@@ -77,7 +77,7 @@ jobs:
       # Provide handy URL for examination of secret leaks for all events that
       # trigger this action.
 
-      - if: github.event_name == 'synchronize' || github.base_ref == ''
+      - if: github.event.action == 'synchronize' || github.base_ref == ''
         name: Provide URL showing code that needs human eyes (force-push or merge)
         shell: bash
         run: |