[cluttermm_tutorial] Replace deprecated cogl_color_set_from_4ub() with cogl_color_init_from_4ub().

[Murray Cumming <murrayc src gnome org>]

commit c6126192cf6f7e6824dca1287997dfad7bedd7b5
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Apr 17 20:57:42 2014 +0200

    Replace deprecated cogl_color_set_from_4ub() with cogl_color_init_from_4ub().

 examples/custom_actor/triangle_actor.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/custom_actor/triangle_actor.cc b/examples/custom_actor/triangle_actor.cc
index 013fb04..a904759 100644
--- a/examples/custom_actor/triangle_actor.cc
+++ b/examples/custom_actor/triangle_actor.cc
@@ -74,7 +74,7 @@ void Triangle::on_paint()
   CoglColor coglcolor;
 
   // Paint the triangle with the actor's color:
-  cogl_color_set_from_4ub(&coglcolor,
+  cogl_color_init_from_4ub(&coglcolor,
     color_.get_red(),
     color_.get_green(),
     color_.get_blue(),
@@ -89,7 +89,7 @@ void Triangle::pick_vfunc(const Clutter::Color& color)
   // This is used by Clutter to detect the actor under the cursor
   // by identifying the unique color under the cursor.
   CoglColor coglcolor;
-  cogl_color_set_from_4ub(&coglcolor,
+  cogl_color_init_from_4ub(&coglcolor,
                           color.get_red(),
                           color.get_green(),
                           color.get_blue(),