Adjust recommended difficulty for taiko

[nanaya]

Resolves #9626 except I don't see any agreement on it yet apart of one suggestion with one thumbs up and one other suggestion.

Feel free to discuss it further here.

For reference, current suggestions are:

1. pp^0.4×0.15
2. pp^0.35×0.27

Base chart if anyone wants to play around with the formula https://www.desmos.com/calculator/cgufjjnq1h

[Ratchet0203]

I'm not a dev so idk if I should say anything, but vunyunt's proposal is best imo. With mangomizer's 0.75 multiplier, I'd get recommended 5.78* maps, which at my level is far too easy. vunyunt's proposal, however, would recommend me 6.59* maps, which is much better. The current formula recommends me 7.51* maps, which I still struggle at. I have 9198pp.

[Alchyr]

I also agree with vunyunt's proposal, mango's is definitely a bit too low

[Glinte]

2170pp gives 3.97 (pp^0.35×0.27), 3.24 (pp^0.4×0.15). Both are too extreme and personally expects 3.4-3.7

[nanaya]

Also remember current recommended search has 0.5 range both ways...

[nanaya]

I guess we'll just go with this for now 🤨