Partition.pm: avoid adding useless code in KS config file

Despite @piojo's comment in #33, I propose a fix for this issue. I am not sure it is making the code much more difficult to understand/follow.

Fixes #33
better replaced with
```
    for my $flag (sort keys %{$self->{flags}}) {
        my $value = $self->{flags}{$flag} ? "on" : "off";
        print "        parted $disk -s -- set $n $flag $value\n";
    }
```
(and remove the flags block above)