fix: remove unused property initializer in FrameHeader.Mods #2602

Job	Run time
Code Quality	6m 0s
Build only (Android)	15m 32s
Build only (iOS)	4m 45s
Resource Budget (Source Overrides)	40s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	33m 8s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	10m 50s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	40m 40s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	16m 25s
Test results	17s
	2h 8m 17s

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