Removing old grub removal step

Closes-bug: #1950701
Change-Id: I01f7190db9924baafac4fbc0b45a4c0e158355cc

diskimage_builder/elements/ubuntu/pre-install.d/00-remove-grub

@@ -1,18 +0,0 @@
-#!/bin/bash
-# The grub post-kernel install hook will barf if the block device can't be
-# found (as happens in a chroot).
-# Temporarily remove grub, to avoid that confusion.
-
-if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
-    set -x
-fi
-set -eu
-set -o pipefail
-
-if dpkg-query -W grub-pc; then
-    apt-get -y remove grub-pc
-fi
-
-if dpkg-query -W grub2-common; then
-    apt-get -y remove grub2-common
-fi