test: drop removed SCSI passthrough feature

This feature has been deprecated since QEMU 5.0 and finally removed in
QEMU 9.1 [0] which now causes issues when running the storage tests on
latest Arch:

------ testcase_long_sysfs_path: BEGIN ------
...
qemu-system-x86_64: -device virtio-blk-pci,drive=drive0,scsi=off,bus=pci_bridge25: Property 'virtio-blk-pci.scsi' not found
E: qemu failed with exit code 1

[0] qemu/qemu@a271b8d

(cherry picked from commit cd57920)
(cherry picked from commit c5baa5d)

Author: mrc0mmand

test/TEST-64-UDEV-STORAGE/test.sh

@@ -495,7 +495,7 @@ EOF
         qemu_opts+=("-device pci-bridge,id=pci_bridge$brid,bus=pci_bridge$((brid-1)),chassis_nr=$((64+brid))")
     done
 
-    qemu_opts+=("-device virtio-blk-pci,drive=drive0,scsi=off,bus=pci_bridge$brid")
+    qemu_opts+=("-device virtio-blk-pci,drive=drive0,bus=pci_bridge$brid")
 
     KERNEL_APPEND="systemd.setenv=TEST_FUNCTION_NAME=${FUNCNAME[0]} ${USER_KERNEL_APPEND:-}"
     QEMU_OPTIONS="${qemu_opts[*]} ${USER_QEMU_OPTIONS:-}"