menuconfig: Suppress spurious pylint tuple unpacking warning

pylint might be afraid that there'd be less than three elements in
'args', but there never is. Fixes this warning:

    scripts/kconfig/menuconfig.py:3184:8: W0632: Possible unbalanced
    tuple unpacking with sequence: left side has 3 label(s), right side
    has 0 value(s) (unbalanced-tuple-unpacking)

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>