Merge pull request #30506 from smoogipoo/mania-key-mod-multiplier

Add default multiplier for mania key mods

Author: peppy

osu.Game.Rulesets.Mania/Mods/ManiaKeyMod.cs

@@ -14,7 +14,7 @@ public abstract class ManiaKeyMod : Mod, IApplicableToBeatmapConverter
         public override string Acronym => Name;
         public abstract int KeyCount { get; }
         public override ModType Type => ModType.Conversion;
-        public override double ScoreMultiplier => 1; // TODO: Implement the mania key mod score multiplier
+        public override double ScoreMultiplier => 0.9;
         public override bool Ranked => UsesDefaultConfiguration;
 
         public void ApplyToBeatmapConverter(IBeatmapConverter beatmapConverter)