[Bug]: non-free-firmware appears to confuse LinuxGSM to try and install steamcmd

### User story

As a developer I dont want LinuxGSM to try and install steamcmd if it detects non-free-firmware

### Game

all

### Linux distro

Debian 12

### Command

command: install

### Further information

steamcmd should only install if non-free repo is available.

### Relevant log output

_No response_

### Steps to reproduce

_No response_