Do not confuse anti-cheat runtimes with Proton

[PaletzTheWise]

Hi,

I ran into an issue where anti-cheat runtimes, whose names start with "Proton " (BattlEye and EasyAntiCheat), were being confused with actual Proton and their identified version happened to be the highest among Proton candidates.

Sat May 23 2026 00:47:23.434846 [Info] - lighthouse: �[32m INFO�[0m �[2mlens_client�[0m�[2m:�[0m trying /home/paletz/.local/share/Steam/steamapps/common/Proton EasyAntiCheat Runtime/proton as proton

This led to a failure of lens-server.exe, since these runtimes do not contain Proton, and I would get the error message

Lens distortion helper is failed to launch, HMD image most probaly will be distorted and unusable. Error: io error: No such file or directory (os error 2)

or

Lens distortion helper is failed to launch, HMD image most probaly will be distorted and unusable. Error: can't find wine in PATH

I tried uninstalling EasyAntiCheat in Steam but nothing happened. So I tried moving its folder away from ~/.local/share/Steam/steamapps/common/ and that did the trick. Then BattlEye became the preferred candidate, so I moved it too. This workaround fixed the issue but it would likely resurface later since I do need those runtimes for the multiplayer games that use them.

Therefore, I have undone the workaround, confirmed the issue is back and made the code change to remove any candidate that contains "Runtime", which fixed the issue again. (Note: These are, in fact, the first four lines of rust I have ever written.)

I used Santeri's instructions (https://github.com/santeri3700/vive-pro-2-on-linux/blob/master/STEAMVR.md) to deploy the driver both with and without the fix.