vgabios: On bda_save_restore() the saved vbe_mode also has flags in it

When restoring a saved state, make sure to remove any flags from the
video mode prior to searching for that mode.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

vgasrc/vgabios.c

diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c
index f5abda6..4aa50e1 100644
--- a/vgasrc/vgabios.c
+++ b/vgasrc/vgabios.c
@@ -259,7 +259,7 @@
                    , sizeof(info->bda_0x84));
         u16 vbe_mode = GET_FARVAR(seg, info->vbe_mode);
         SET_BDA_EXT(vbe_mode, vbe_mode);
-        struct vgamode_s *vmode_g = vgahw_find_mode(vbe_mode);
+        struct vgamode_s *vmode_g = vgahw_find_mode(vbe_mode & ~MF_VBEFLAGS);
         SET_BDA_EXT(vgamode_offset, (u32)vmode_g);
         SET_IVT(0x1f, GET_FARVAR(seg, info->font0));
         SET_IVT(0x43, GET_FARVAR(seg, info->font1));