resources: grub: config: unify dev and devices variables.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>

resources/grub/config/grub.cfg

@@ -136,8 +136,8 @@ menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o
 
 	set pager=0
 	echo -n "Attempting to unlock encrypted volumes"
-	for dev in ${ahcidev} ${atadev} ${raidvol}; do
-		if cryptomount "${dev}" ; then break ; fi
+	for device in ${ahcidev} ${atadev} ${raidvol}; do
+		if cryptomount "${device}" ; then break ; fi
 	done
 
 	for device in (*) ; do