tty/vt: defkeymap.c_shipped, little unification with loadkeys

loadkeys 2.4.0 currently:
* notes the use of --unicode to the output, and
* uses "unsigned short" for key_maps instead of "ushort".

So make our shipped file consistent with the generated output in this
regard.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220602083128.22540-1-jslaby@suse.cz


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>