[balance] Removed unnecessary usage of QLocale. Force btrfs to run in C locale to avoid bad parsing surprises. Contributes to JB#26482
[balance] Removed unnecessary usage of QLocale. Force btrfs to run in C locale to avoid bad parsing surprises. Contributes to JB#26482

izh1979/btrfs-balancer,izh1979/btrfs-balancer,sailfishos/btrfs-balancer,sailfishos/btrfs-balancer