fix: update condition for remote manifest comparison in validate-flags workflow

Signed-off-by: Michael Beemer <beeme1mr@users.noreply.github.com>

Author: beeme1mr

.github/workflows/validate-flags.yaml

@@ -32,7 +32,8 @@ jobs:
         run: cat flags.json && cat against-flags.json
 
       - name: Compare against remote manifest
-        if: ${{ secrets.FLAGD_STUDIO_TOKEN != '' }} # Secret not accessible for PRs from forks
+      # Secret not accessible for PRs from forks
+        if: github.repository == github.event.repository.full_name
         uses: open-feature/action@v0.0.2
         with:
           manifest: "flags.json"