Adjust aim difficult strain count to account less for flowed notes

[kwotaq]

Difficult strain count has been historically bigger on stream maps due to their natural higher note count. As a result, this produces a much more lenient miss penalty for flow aim map as opposed to snap aim. Now that we have a snap-flow split we can actually use the probability of flowing a note to reduce its impact to the difficult strain count total and make the miss penalty for flow aim more in tune with snap aim maps.

[Finadoggie]

I fear this may make it so increasing map rate could potentially decrease pp for the same score. See the following scenario:

Score has several misses -> Rate is increased -> Agility increases -> Snap probability goes down -> Top weighted strain count decreases -> Stronger miss penalty -> Less total pp

Unsure if this would matter in real-world cases but I thought it was worth mentioning