Revert "grub2: Exit gracefully if the configuration has BLS enabled"
    
    This reverts commit 985a14100295c99d0c6d712bfbee0ec52a3a1601.
    
    Reverting for now due to some users experiencing no boot entries after
    upgrading. See for background:
    
    https://github.com/ostreedev/ostree/pull/1929
    https://discussion.fedoraproject.org/t/boot-entries-gone-after-upgrade/8026
    
    ---
    
    Seems silly to revert this by an additional patch, instead of dropping
    the patch that enabled it in the first place. Though I think this
    approach has a higher chance of the revert not being accidentally
    dropped when doing the next rebase.