[SCSI] qla2xxx: Remove setting Scsi_host->this_id during adapter probe.

Setting this to 255 will cause any target with id 255 to not show up so leave
it at the default in our host template.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>