Hubble CLI shows superfluous `v` using `--version` flag

When running the hubble cli using the `--version` flag (not documented in the --help though) it shows an extra `v` in front of the version.
The command `version` does show it correctly though.

```bash
# Using the flag
hubble --version
hubble vv1.16.3

# Using the command
hubble version
hubble v1.16.3@HEAD-5d300c4 compiled with go1.23.2 on linux/amd64
```
