Adds dependency on bsdmainutils for hexdump

Adds a dependency on the bsdmainutils [1] package, which is a transactional
package that for all supported Ubuntu releases provides hexdump.

The missing hexdump package caused a user to be unable to restore their backup
except with Clonezilla [2]

[1] https://packages.ubuntu.com/kinetic/bsdmainutils

[2] #382

src/apps/rescuezilla/debian/control

@@ -10,7 +10,7 @@ Vcs-Git: https://github.com/rescuezilla/rescuezilla.git
 
 Package: rescuezilla
 Architecture: all
-Depends: ${shlibs:Depends}, ${misc:Depends}, smbclient, fsarchiver, partclone, pv, pigz, nmap, os-prober, gvfs, cifs-utils, smbclient, sshfs, sshpass, nfs-common, fsarchiver, file, xdg-utils, libnotify-bin, lshw, pciutils, yad, hdparm, pbzip2, lzop, pixz, plzip, lrzip, zstd, fatresize, archivemount, nbd-server, nbd-client, python3-whichcraft, python3-babel, clonezilla, lvm2, binutils, smartmontools, qemu-utils, efibootmgr
+Depends: ${shlibs:Depends}, ${misc:Depends}, smbclient, fsarchiver, partclone, pv, pigz, nmap, os-prober, gvfs, cifs-utils, smbclient, sshfs, sshpass, nfs-common, fsarchiver, file, xdg-utils, libnotify-bin, lshw, pciutils, yad, hdparm, pbzip2, lzop, pixz, plzip, lrzip, zstd, fatresize, archivemount, nbd-server, nbd-client, python3-whichcraft, python3-babel, clonezilla, lvm2, binutils, smartmontools, qemu-utils, efibootmgr, bsdmainutils
 Recommends: partimage, ecryptfs-utils, nbdkit
 Description: Graphical hard drive backup and restore
  Rescuezilla is an easy-to-use disk cloning and imaging application that's