fs-repo-migrations should not ignore arguments

Ignoring arguments can lead people to wrongly think that it has some hidden features:

```
> fs-repo-migrations versions
Found fs-repo version 2 at /home/utilisateur/.ipfs
Do you want to upgrade this to version 3? [y/n] n

> fs-repo-migrations sdff sdfsf sdfsdf 
Found fs-repo version 2 at /home/utilisateur/.ipfs
Do you want to upgrade this to version 3? [y/n] n
```
