Revert "Don't harcode grub2 in the spec file"
    
    Two issues:
    - line 538 switches the filename from "grub" to "grub2" where it
      shouldn't
    - in general, things that aren't referring to the packaging itself
      shouldn't be %{name}; it just makes them less flexible.
    
    This reverts commit 967c5629ed9fdb4e8572daa78f3bb5ac5e675e77.