fix: default to OpenGL on fresh installs to prevent Vulkan black screen #2561

Job	Run time
Build only (Android)	11m 7s
Resource Budget (Source Overrides)	24s
Code Quality	5m 37s
Build only (iOS)	3m 5s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	53m 13s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	53m 13s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	53m 21s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	53m 22s
Test results	1s
	3h 53m 23s

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