Fix incorrect math.linalg.cross3 indices.

core/math/linalg/linalg.odin

@@ -26,8 +26,8 @@ cross2 :: proc(a, b: $T/[2]$E) -> E {
 
 cross3 :: proc(a, b: $T/[3]$E) -> (c: T) {
 	c[0] = +(a[1]*b[2] - b[1]*a[2]);
-	c[1] = -(a[2]*b[3] - b[2]*a[3]);
-	c[2] = +(a[3]*b[1] - b[3]*a[1]);
+	c[1] = -(a[2]*b[0] - b[2]*a[0]);
+	c[2] = +(a[0]*b[1] - b[0]*a[1]);
 	return;
 }