Fix wget install instructions
Fix wget install instructions

Looks like we have a dangling `.tar.gz` and we probably want the directory we just extracted.
```
root@packer:~# tar -xzpf openscap-${version}.tar.gz
root@packer:~# cd openscap-${version}.tar.gz
bash: cd: openscap-1.2.13.tar.gz: Not a directory
root@packer:~# ls
openscap-1.2.13  openscap-1.2.13.tar.gz
```

jan-cerny/openscap,redhatrises/openscap,Hexadorsimal/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,mpreisler/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,OpenSCAP/openscap,redhatrises/openscap,Hexadorsimal/openscap,mpreisler/openscap,mpreisler/openscap,jan-cerny/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,Hexadorsimal/openscap,mpreisler/openscap,OpenSCAP/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,OpenSCAP/openscap,mpreisler/openscap,OpenSCAP/openscap