Save image and save video formating does not work if prefix string is supplied by noodle

### Custom Node Testing

- [ ] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

The issue happens regardless of custom nodes or native nodes, but the issue affects native nodes AND custom nodes.

If a save node has a filename prefix of %date:yyyy-MM-DD% the resulting saved file will the current date as a filename. In theory then, if a STRING node is connected to the filename prefix widget-input, and the STRING node has %date:yyyy-MM-DD%, then the resulting saved file SHOULD have the current date as a filename.

### Actual Behavior

File is saved with %date*yyyy-MM-DD% prefix

### Steps to Reproduce

### Debug Logs

```powershell
no log
```

### Other

_No response_