Update nightly.yaml

Author: benja2998

.github/workflows/nightly.yaml

@@ -72,6 +72,6 @@ jobs:
             ${{ env.RELEASE_NOTES }}
 
             Note that this release is automated per COMMIT. Stability may vary.
-          files: installer\OpenCMDInstaller.exe
+          files: installer/OpenCMDInstaller.exe
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}