Fix RPM-GPG-KEY-fedora-39-primary
- Remove blank space from line
- Add newline to the end of the file
This was previously throwing this error:
```
$ sudo rpm --import ./RPM-GPG-KEY-fedora-39-x86_64
error: ./RPM-GPG-KEY-fedora-39-x86_64: key 1 not an armored public key
```