fix #69 (#70)

Add a search command line to `grub.cfg` for find `grub-btrfs.cfg`
`search -f --set=root --no-floppy /grub/grub-btrfs.cfg`

41_snapshots-btrfs

@@ -243,7 +243,7 @@ snapshot_list()
 		local snapper_types=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 2))
 
 		IFS=$'\n'
-		local snapper_descriptions=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | cut -d'|' -f 7))
+		local snapper_descriptions=($(snapper -t 0 -c "$snapper_config" list | tail -n +3 | rev | cut -d'|' -f 2 | rev))
 	fi
 
 	IFS=$'\n'
@@ -545,6 +545,7 @@ root_grub="$(make_system_path_relative_to_its_root /boot/$grub_directory)"
 # Make a submenu in GRUB (grub.cfg)
 cat << EOF
 submenu '${submenuname}' {
+	search -f --set=root --no-floppy /grub/grub-btrfs.cfg
 	configfile "${root_grub}/grub-btrfs.cfg"
 }
 EOF