ci: fix spamoor benchmark artifact download path

Author: chatton

.github/workflows/benchmark.yml

@@ -84,6 +84,7 @@ jobs:
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           name: spamoor-benchmark-results
+          path: test/e2e/
 
       # only update the benchmark baseline on push/dispatch, not on PRs
       - name: Store EVM Contract Roundtrip result