vconsole: don't do GIO_SCRNMAP / GIO_UNISCRNMAP

vconsole: don't do GIO_SCRNMAP / GIO_UNISCRNMAP

GIO_SCRNMAP / GIO_UNISCRNMAP are related to what setfont does with -m
option - namely setting intermediate map from 8bit values into unicode
values. This map is global, so single setfont invocation sets it for
all applicable consoles.

Furthermore calling GIO_SCRNMAP before GIO_UNISCRNMAP causes issues as
the former corrupts values > 255 (UNI alone would be sufficient).

The bug can be easily tested with the following conf:

KEYMAP=pl
FONT=LatArCyrHeb-16
FONT_MAP=8859-2