Minor demo tweak.

extras/Demo/Source/Demos/OpenGLDemo.cpp

@@ -675,7 +675,7 @@ struct OpenGLDemoClasses
             openGLContext.extensions.glBindBuffer (GL_ARRAY_BUFFER, 0);
             openGLContext.extensions.glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
 
-            if (! isMouseButtonDown())
+            if (! isMouseButtonDownAnywhere())
                 rotation += (float) rotationSpeed;
         }