Fix failed scores with no hits on beatmaps with ridiculous mod combin…

…ations showing hundreds of pp points awarded (#31741)

See
https://discord.com/channels/188630481301012481/1097318920991559880/1334716356582572074.

On `master` this is actually worse and shows thousands of pp points, so
I guess `pp-dev` is a comparable improvement, but still flagrantly
wrong. The reason why `pp-dev` is better is the `speedDeviation == null`
guard at the start of `computeSpeedValue()` which turns off the rest of
the calculation, therefore not exposing the bug where
`relevantTotalDiff` can go negative. I still guarded it in this commit
just for safety's sake given it is clear it can do very wrong stuff.

osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs

@@ -273,7 +273,7 @@ private double computeSpeedValue(ScoreInfo score, OsuDifficultyAttributes attrib
             speedValue *= speedHighDeviationMultiplier;
 
             // Calculate accuracy assuming the worst case scenario
-            double relevantTotalDiff = totalHits - attributes.SpeedNoteCount;
+            double relevantTotalDiff = Math.Max(0, totalHits - attributes.SpeedNoteCount);
             double relevantCountGreat = Math.Max(0, countGreat - relevantTotalDiff);
             double relevantCountOk = Math.Max(0, countOk - Math.Max(0, relevantTotalDiff - countGreat));
             double relevantCountMeh = Math.Max(0, countMeh - Math.Max(0, relevantTotalDiff - countGreat - countOk));
@@ -297,7 +297,7 @@ private double computeAccuracyValue(ScoreInfo score, OsuDifficultyAttributes att
                 amountHitObjectsWithAccuracy += attributes.SliderCount;
 
             if (amountHitObjectsWithAccuracy > 0)
-                betterAccuracyPercentage = ((countGreat - (totalHits - amountHitObjectsWithAccuracy)) * 6 + countOk * 2 + countMeh) / (double)(amountHitObjectsWithAccuracy * 6);
+                betterAccuracyPercentage = ((countGreat - Math.Max(totalHits - amountHitObjectsWithAccuracy, 0)) * 6 + countOk * 2 + countMeh) / (double)(amountHitObjectsWithAccuracy * 6);
             else
                 betterAccuracyPercentage = 0;