kern.sched.topology_spec sysctl: use step of 1 for group levels numeration
kern.sched.topology_spec sysctl: use step of 1 for group levels numeration

This is just a cosmetic change for prettier output.
'indent' variable/parameter serves two purposes: it specifies whitespace
indentation level and also implies cpu group level/depth.
It would have been better to split those two uses,
but for now just a simple change.

MFC after:	1 week

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