Allow specifying wrappers in the env var section again

[CommandMC]

With this patch, you can now enter wrappers into the environment variable section of the game settings again & they will be properly executed instead of being added as empty variables

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[flavioislima]

Looks good but can you check with gamescope or other tools?

[CommandMC]

I've tested it with gamescope now & just by adding echo before, works fine. People on the issue are also reporting that it's working. So I guess I'll merge?

[flavioislima]

Yes, ready to merge! :D