[rear-devel] [rear/rear] 172a0f: Update 300_create_grub.sh

[Johannes Meixner]

  Branch: refs/heads/jsmeix-improve-GRUB2-USB
  Home:   https://github.com/rear/rear
  Commit: 172a0f42a3b27520a385f035c1828b375b5cff12
      https://github.com/rear/rear/commit/172a0f42a3b27520a385f035c1828b375b5cff12
  Author: Johannes Meixner <jsmeix at suse.com>
  Date:   2021-07-21 (Wed, 21 Jul 2021)

  Changed paths:
    M usr/share/rear/output/USB/Linux-i386/300_create_grub.sh

  Log Message:
  -----------
  Update 300_create_grub.sh

To be on the safe side have the label "REARBOOT" only 8 characters long.