Remove unused device parameter from a few GParted_Core methods

resize_move() and move() stopped using the device parameter in this
commit from 2006-07-23:
    d663c3c2
    removed cylindersize buffering during resize from the filesystems. It is

create() stopped using the device parameter in this commit from 2006-03-19:
    ad9f2126
    fixed issues with copying (see also #335004) cleanups + added FIXME added

For reference most other operation methods had the device parameter
removed in this earlier commit from 2005-12-07:
    642f0a14
    from now on each partition has a reference to it's device. make use of new