fdisk: use 2 decimal places for size in disk summary

fdisk: use 2 decimal places for size in disk summary

 In the disk summary it seems nice, but I'm not sure about lists (SIZE
 columns). It seems more readable to keep the lists with one decimal
 place only. New output:

  # sfdisk --list /dev/sda

 Old output:
  Disk /dev/sda: 223.6 GiB, 240057409536 bytes, 468862128 sectors

 New output:
  Disk /dev/sda: 223.58 GiB, 240057409536 bytes, 468862128 sectors

 The rest is unchanged:
  ...
  Device         Start       End   Sectors   Size Type
  /dev/sda1       2048    411647    409600   200M EFI System
  /dev/sda2     411648    821247    409600   200M Linux filesystem
  /dev/sda3     821248 274087935 273266688 130.3G Linux filesystem
  /dev/sda4  274087936 378945535 104857600    50G Linux filesystem
  /dev/sda5  378945536 468862094  89916559  42.9G Linux filesystem

Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1673452
Signed-off-by: Karel Zak <kzak@redhat.com>