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aux/vga: revert vbegetmode

--- a/sys/src/cmd/aux/vga/vesa.c

+++ b/sys/src/cmd/aux/vga/vesa.c

@@ -895,18 +895,11 @@

 vbegetmode(Vbe *vbe)

 {

 	Ureg u;

-	char size[32];

-	Mode *m;

-	vbesetup(vbe, &u, 0x5F29);

-	u.bx = 0x8000; /* current mode */

-	vbecall(vbe, &u);

-	if(u.ax != 0x5f)

-		return -1;

-	snprint(size, sizeof(size), "%dx%dx%d",

-		(int)u.bx>>16, (int)u.bx & 0xffff, (int)u.cx & 0xff);

-	m = dbvesamode(size);

-	return m == nil ? -1 : atoi(dbattr(m->attr, "id"));

+	vbesetup(vbe, &u, 0x4F03);

+	if(vbecall(vbe, &u) < 0)

+		return 0;

+	return u.bx;

 }

 int