Boosting the vm.max_map_count in Ubuntu

Apparently, the SteamOS already has a larger vm.max_map_count by default. Can we do the same on upcoming version of Ubuntu.

https://github.com/ValveSoftware/Proton/issues/6510#issuecomment-1422699309

Seems to help with some games’ stability (e.g. Hogwarts Legacy).

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