trivial: fu-util: output newline after prompt.
trivial: fu-util: output newline after prompt.

Before:
```
Uploading firmware reports helps hardware vendors to quickly identify failing and successful updates on real devices.
Upload report now? (Requires internet connection):0.	Do not upload reports at this time, but prompt again for future updates
1.	Do not upload reports, and never ask to upload reports for future updates
2.	Upload reports just this one time, but prompt again for future updates
3.	Upload reports this time and automatically upload reports after completing future updates
```

After:
```
Uploading firmware reports helps hardware vendors to quickly identify failing and successful updates on real devices.
Upload report now? (Requires internet connection):
0.	Do not upload reports at this time, but prompt again for future updates
1.	Do not upload reports, and never ask to upload reports for future updates
2.	Upload reports just this one time, but prompt again for future updates
3.	Upload reports this time and automatically upload reports after completing future updates
```

fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd