scsi: target: core: Fix complete_type use

scsi: target: core: Fix complete_type use

There were two copy and paste type of errors where I swapped 'complete'
with 'submit' names. Use the correct variables and definitions.

This problem was found by Dmitry Bogdanov and this patch builds on top of
his patch to fix a second instance that was found.

Fixes: 06933066d88a ("scsi: target: Add support for completing commands from backend context")
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
[mnc: Fixed second instance]
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://patch.msgid.link/20260307220630.131008-1-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>