qemuhelptest: convert runaway tab to spaces

Make syntax-check happy and smiling again.

tests/qemuhelptest.c

@@ -845,7 +845,7 @@ mymain(void)
             QEMU_CAPS_SCSI_LSI,
             QEMU_CAPS_VIRTIO_SCSI_PCI,
             QEMU_CAPS_BLOCKIO,
-	    QEMU_CAPS_SCSI_DISK_WWN,
+            QEMU_CAPS_SCSI_DISK_WWN,
             QEMU_CAPS_SECCOMP_SANDBOX);
 
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;