[gtk+] gtk4-demo: fix a typo

[Matthias Clasen <matthiasc src gnome org>]

commit 515f5268c25de89aecb86d89c8170c875b64d145
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 7 23:26:57 2017 -0400

    gtk4-demo: fix a typo
    
    The blend mode is called saturation, not saturate.

 demos/gtk-demo/css_blendmodes.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/demos/gtk-demo/css_blendmodes.c b/demos/gtk-demo/css_blendmodes.c
index 9965bf6..ecc7da8 100644
--- a/demos/gtk-demo/css_blendmodes.c
+++ b/demos/gtk-demo/css_blendmodes.c
@@ -28,7 +28,7 @@ struct {
   { "Multiply", "multiply" },
   { "Normal", "normal" },
   { "Overlay", "overlay" },
-  { "Saturate", "saturate" },
+  { "Saturate", "saturation" },
   { "Screen", "screen" },
   { "Soft Light", "soft-light" },
   { NULL }