grub: Add/fix --id to cfg

features.in/grub/cfg.in/10localboot_bios.cfg

 if [ "$grub_platform" = "pc" ]; then
-  menuentry $"Boot from hard drive" {
+  menuentry $"Boot from hard drive" --id 'harddisk' {
     insmod part_msdos
     insmod chain
     set oldroot="$root"

features.in/grub/cfg.in/40lang.cfg

-submenu $"Change language (press F2)" --hotkey 'f2' {
+submenu $"Change language (press F2)" --hotkey 'f2' --id 'lang' {
 	insmod regexp
 	for langstr in "ru_RU=Russian" "en_US=English" "pt_BR=Portuguese" "kk_KZ=Kazakh" "uk_UA=Ukrainian"; do
 		regexp -s 2:langname -s 1:langcode '(.*)=(.*)' "$langstr"

features.in/grub/cfg.in/89kernel.cfg

-submenu $"Change Kernel Flavour (press F5)" --hotkey 'f5' {
+submenu $"Change Kernel Flavour (press F5)" --hotkey 'f5' --id 'kflavour' {
 	insmod regexp
 	regexp -s 1:kflavours -s 2:kflavourstr '(.*) (.*)' "@KFLAVOUR@"
 	menuentry "${kflavourstr}" {

features.in/grub/cfg.in/90hdt_bios.cfg

 if [ "$grub_platform" = "pc" ]; then
-  menuentry $"Hardware Info" {
+  menuentry $"Hardware Info" --id 'hdt' {
     linux16 /boot/memdisk
     initrd16 /boot/hdt.img
   }

features.in/grub/cfg.in/91shell_efi.cfg

 if [ "$grub_platform" = "efi" ]; then
-	menuentry $"EFI shell" --id 'EFI shell' {
+	menuentry $"EFI shell" --id 'efishell' {
 		chainloader /EFI/shellx64.efi
 		boot
 	}

features.in/grub/cfg.in/95sdab_bios.cfg

 if [ "$grub_platform" = "pc" ]; then
-  menuentry $"Boot from 1st hard/flash drive" {
+  menuentry $"Boot from 1st hard/flash drive" --id 'sda' {
     insmod part_msdos
     insmod chain
     set oldroot="$root"
@@ -8,7 +8,7 @@ if [ "$grub_platform" = "pc" ]; then
     set root="$oldroot"
   }
 
-  menuentry $"Boot from 2nd hard/flash drive" {
+  menuentry $"Boot from 2nd hard/flash drive" --id 'sdb' {
     insmod part_msdos
     insmod chain
     set oldroot="$root"