Bridges openfut-launcher c542415 onto the already-built launcher on .105 by writing
WINEDLLOVERRIDES=version=n,b into game_profile.env, which that build does apply.
Forward-compatible: the fixed launcher defers to a profile that already pins
version=, so this value simply wins.
Records the prior value -- including its absence, as the literal <absent> -- to a
sidecar before mutating, so revert restores the real previous state instead of
assuming the key was missing. Refuses to edit while the launcher runs, since it holds
its config in memory and would write the stale value back.