Revert "PAX LOG: enable PAX_LOG and PAX_ULOG by default after KTR conversion"

Panic on uprintf due PROC_LOCK recursion.

This reverts commit 83b48da3b4f3b0a3e644b53ce68234e6a71d4101.

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>