esp: install grub in ubuntu bootloader id path, instead of removable.

Do not use removable uefi bootloader path in the cloud-images by
default, as that prevents upgrades of the bootloader.

LP: #1912830

live-build/ubuntu-cpc/hooks.d/base/disk-image-uefi.binary

@@ -195,19 +195,9 @@ EOF
         --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