Revert "Drop use of --removable flag to grub-install from buildd/hooks"

This reverts commit e55a349683.

live-build/buildd/hooks/02-disk-image-uefi.binary

@@ -102,9 +102,19 @@ install_grub() {
         --boot-directory=/boot \
         --efi-directory=/boot/efi \
         --target=${efi_target} \
+        --removable \
         --uefi-secure-boot \
         --no-nvram
 
+    if [ -f mountpoint/boot/efi/EFI/BOOT/grub.cfg ]; then
+        sed -i "s| root| root hd0,gpt1|" mountpoint/boot/efi/EFI/BOOT/grub.cfg
+        sed -i "1i${IMAGE_STR}" mountpoint/boot/efi/EFI/BOOT/grub.cfg
+        # For some reason the grub disk is looking for /boot/grub/grub.cfg on
+        # part 15....
+        chroot mountpoint mkdir -p /boot/efi/boot/grub
+        chroot mountpoint cp /boot/efi/EFI/BOOT/grub.cfg /boot/efi/boot/grub
+    fi
+
     if [ "$ARCH" = "amd64" ]; then
         # Install the BIOS/GPT bits. Since GPT boots from the ESP partition,
         # it means that we just run this simple command and we're done