storage/lvm: add more details to refused volume shrink message
storage/lvm: add more details to refused volume shrink message

Include old and new size.

marmarek/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin