change grub init tune

yes it was descriptive but too large. this fixes #180

configs/releng/grub/grub.cfg

@@ -16,14 +16,7 @@ fi
 
 # GRUB init tune for accessibility
 #
-# Morse translation table:
-# "." is "500 1 300 1"
-# "-" is "600 3 300 1"
-# " " is "100 2"
-# "/" is "100 5"
-#
-# Message: "s for blind"
-play 500 500 1 300 1 500 1 300 1 500 1 300 1 100 5 500 1 300 1 500 1 300 1 100 2 500 1 300 1 500 1 300 1 600 3 300 1 500 1 300 1 100 5 600 3 300 1 500 1 300 1 500 1 300 1 500 1 300 1 100 2 500 1 300 1 600 3 300 1 500 1 300 1 500 1 300 1 100 2 500 1 300 1 500 1 300 1 100 2 500 1 300 1 500 1 300 1 100 2 600 3 300 1 500 1 300 1 100 2 600 3 300 1 500 1 300 1 500 1 300 1
+play 600 988 1 1319 4
 
 menuentry "Arch Linux install medium (x86_64, UEFI)" {
     set gfxpayload=keep
@@ -67,4 +60,4 @@ menuentry "System shutdown" {
 menuentry "System restart" {
 	echo "System rebooting..."
 	reboot
-}
\ No newline at end of file
+}