In order to make `highlightedColour` dependent on the mod type color, the color is converted to an `osu.Framework.Graphics.Colour4` and calls `Lighten`.
This was meant to be an optimisation to allow the background to load
while the intro is playing, but as the current default intro loads a
background itself, this was rarely the case and also counter-productive
as it would bypass the equality check and start a second load sequence.