fix: use ColourInfo == Colour4 comparison in TestSceneHyperDashColouring to avoid SRGB precision loss

Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/3be4f163-f2b7-40d4-803a-c0cc41ca8b50

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>

Author: Copilot

osu.Game.Rulesets.Catch.Tests/TestSceneHyperDashColouring.cs

@@ -197,7 +197,7 @@ private Drawable setupSkinHierarchy(Drawable child, ISkin skin)
 
         private bool checkLegacyFruitHyperDashColour(DrawableFruit fruit, Colour4 expectedColour) =>
             fruit.ChildrenOfType<SkinnableDrawable>().FirstOrDefault()?.Drawable.ChildrenOfType<Sprite>()
-                 .Any(c => c.Colour.TopLeft.SRGB == expectedColour) == true;
+                 .Any(c => c.Colour == expectedColour) == true;
 
         private class TestSkin : LegacySkin
         {