[rear-devel] [rear/rear] b17630: Update 200_check_usb_layout.sh

[Johannes Meixner]

  Branch: refs/heads/jsmeix-USB-BIOS-boot-partition
  Home:   https://github.com/rear/rear
  Commit: b17630d307965adf0b3084f3233c814fb58cb12b
      https://github.com/rear/rear/commit/b17630d307965adf0b3084f3233c814fb58cb12b
  Author: Johannes Meixner <jsmeix at suse.com>
  Date:   2021-07-21 (Wed, 21 Jul 2021)

  Changed paths:
    M usr/share/rear/format/USB/default/200_check_usb_layout.sh

  Log Message:
  -----------
  Update 200_check_usb_layout.sh

Let the error message match the actually tested condition