trace_zil.h: rename zcw_zio_error to zcw_error

Rename zcw_zio_error to zcw_error in trace_zil.h that was missed
in commit f562e0f69. This fixes compilation errors exposed when building
with --with-linux=.

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #17654