Reset effectiveMissCount when calculating pp

[Givikap120]

If using one OsuPerformanceCalculator object when calculating 2 different scores - second score can use misscount from first score

For example. First score had 6 misses, so effectiveMissCount starting value will be 6.
If second score has 0 misses, this can happen:

// effectiveMissCount = 6, countMiss = 0
double fullComboThreshold = 200;

if (210 < 200) // not called
    effectiveMissCount = fullComboThreshold / Math.Max(1.0, scoreMaxCombo);
    
effectiveMissCount = Math.Min(effectiveMissCount, totalImperfectHits);
effectiveMissCount = Math.Min(6, 10) = 6;

effectiveMissCount = Math.Max(countMiss, effectiveMissCount);
effectiveMissCount = Math.Max(0, 6) = 6;
// Now effectiveMissCount is 6 when it should be 0

[smoogipoo]

!diffcalc

[github-actions]

Target: #30518
Spreadsheet: https://docs.google.com/spreadsheets/d/1laQUEq97qtcqDB031Dlf3lzzv15IbSdkINfVaIlLrQs/edit

[smoogipoo]

It's not really meant to be used this way but sure, I see no harm in this.