[Feat] Remove "Use dedicated graphics card" / PRIME run option

[CommandMC]

Users often toggle this option by mistake, either while only using one GPU (seems like a warning wasn't enough there), or thinking they have to toggle it for their dGPU to be used. To combat this, remove the toggle in the Frontend (but still handle the option for existing setups); if users really need those env vars, they can add them themselves

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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)

[arielj]

I wonder if we can just remove this setting.

Maybe it was needed before but lately I only see this causing issues. And I feel like it's some edge case that if someone knows they need it (to toggle it intentionally) they can probably just add the variable that we add?

Or maybe we can change the name of the setting to be Set NVIDIA_PRIME=... environment variable, so users who have no idea what that is don't turn it on.

Because I feel some users will still toggle that incorrectly when trying to make something work and leave it on by mistake sometimes.

[CommandMC]

Definitely in favor of removing this in the long run, just didn't want to risk breaking existing setups

[arielj]

maybe we can remove the UI but keep the setting handled in the backend if already set to true?

that way existing setups won't break and new users won't turn it on by mistake