Fix can't find manifest file

Author: sunnamed434

.github/workflows/Update.Unturned.Redist.yaml

@@ -130,7 +130,7 @@ jobs:
       - name: Compare current vs saved manifest
         id: compare_manifest
         run: |
-          MANIFEST_FILE="redist/redist-manifests/.manifest.${{ matrix.variant }}.txt"
+          MANIFEST_FILE="redist/redist-manifests/.manifest.redist-${{ matrix.variant }}.txt"
           chmod +x depot_downloader/DepotDownloader
           manifest_output=$(depot_downloader/DepotDownloader \
             -app $APP_ID \