Fix a couple of typos in rotation matrix
diff --git a/wayland-system-compositor.c b/wayland-system-compositor.c
index 5da2e7e..e8e46c2 100644
--- a/wayland-system-compositor.c
+++ b/wayland-system-compositor.c
@@ -305,8 +305,8 @@
GLdouble s = sin(angle);
struct wlsc_matrix rotate = {
{ x * x * (1 - c) + c, y * x * (1 - c) + z * s, x * z * (1 - c) - y * s, 0,
- x * y * (1 - c) - z * s, y * y * (1 - c) + c, y * z * (1 - c) - x * s, 0,
- x * z * (1 - c) + y * x, y * z * (1 - c) - x * s, z * z * (1 - c) + c, 0,
+ x * y * (1 - c) - z * s, y * y * (1 - c) + c, y * z * (1 - c) + x * s, 0,
+ x * z * (1 - c) + y * s, y * z * (1 - c) - x * s, z * z * (1 - c) + c, 0,
0, 0, 0, 1 }
};