Missing colon in CMakeLists.txt

Not sure how this was ever working.

tutorial/CMakeLists.txt

@@ -102,7 +102,7 @@ if(LIBIGL_TUTORIALS_CHAPTER7)
     igl_add_tutorial(707_SweptVolume igl::glfw)
     igl_add_tutorial(708_Picking igl::glfw)
     igl_add_tutorial(709_SLIM igl::glfw)
-    igl_add_tutorial(710_SCAF igl::glfw igl_restricted:triangle)
+    igl_add_tutorial(710_SCAF igl::glfw igl_restricted::triangle)
     igl_add_tutorial(711_Subdivision igl::glfw)
     igl_add_tutorial(712_DataSmoothing igl::glfw)
     igl_add_tutorial(713_ShapeUp igl::glfw)