Fix privatestorageops issue 278: Unknown key name 'LimitNOFILESoft'
Fixes https://whetstone.privatestorage.io/privatestorage/privatestorageops/-/issues/278
Refers https://whetstone.privatestorage.io/privatestorage/privatestorageops/-/issues/21
This removes the faulty LimitNOFILESoft
option - the error message
Unknown key name 'LimitNOFILESoft' in section 'Service', ignoring
was indeed correct. If only LimitNOFILE is set, systemd will set both soft and hard limits to the same number.