Fix the "passability" test in fdcopy().

Rather than checking to see if a descriptor is a kqueue, check to see if
its fileops flags include DFLAG_PASSABLE.

At the moment, these two tests are equivalent, but this will change with
the addition of capabilities that wrap kqueues but are themselves of type
DTYPE_CAPABILITY. We already have the DFLAG_PASSABLE abstraction, so let's
use it.

This change has been tested with [the newly improved] tools/regression/kqueue.

Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc

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