Fix TestFruitColourFallback: use AddUntilStep and explicit SRGB compa… #2437

Job	Run time
Resource Budget (Source Overrides)	26s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	15m 16s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	52m 16s
Build only (iOS)	2m 58s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	10m 52s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	30m 42s
Build only (Android)	16m 14s
Code Quality	5m 20s
Test results	11s
	2h 14m 15s

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