video: fbdev: atari: Remove bogus FB_VMODE_YWRAP flags

Vertical wrap is not supported (fb_fix_screeninfo.ywrapstep = 0), hence
there is no point in setting the FB_VMODE_YWRAP flag in video modes.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>