Check and use .steam path for Steam Linux Runtime

[redromnon]

Describe the bug

By default, Heroic uses the .local/share/Steam path for the Steam Linux runtime. But Ubuntu-based distros like Pop_OS don't use symlink to the .local/share/Steam directory and may not even have the Steam dir in local.
This makes the Steam Runtime feature unusable for such users as the Steam runtimes are only included under .steam despite enabling Steam Runtime.

Add logs

Launch Command: /usr/local/bin/mangohud --dlsym /usr/games/gamemoderun /opt/Heroic/resources/app.asar.unpacked/build/bin/linux/gogdl launch /home/redromnon/Games/Heroic/OpenTTD 1293297882 --platform linux

Steps to reproduce

1. Go to any game
2. Click Settings
3. Click Other
4. Enable Steam Runtime

Expected behavior

Heroic should include the Steam runtime in the launch command.

Screenshots

None

System Information

• OS : Pop_OS 22.04
• Heroic Version : 2.3.3

Additional information

Implement a check and use the suitable or available path (.local/share/Steam or .steam) for Steam Runtime.

[CommandMC]

I've now created #1359 to change the path to ~/.steam/root/....
I've tested it in a PopOS VM and it seems to work, could you give it a go yourself?

[redromnon]

I can confirm that it's working.

[redromnon]

Will permanently setting the Steam Rumtime path to ~/steam/root/... and not ~/.local/share/Steam/...?

[CommandMC]

I think it's the more compatible option. From what I've seen that's generally what other scripts involving Steam use as well