remove now unnecessary 'todo' comment

ggdt/src/system/input_devices/mouse/cursor.rs

@@ -1,7 +1,3 @@
-// TODO: in the near future, this will need to be re-worked again somewhat to provide implementations
-//       that are not specific to just our 256 colour Bitmap functionality. whether this takes the form
-//       of a generified CustomMouseCursor struct, or multiple versions ... well, i'm not quite sure yet!
-
 use crate::graphics::*;
 use crate::graphics::indexed::*;
 use crate::math::*;