Use correct formula in Beatmap/Circle_size

[secretbnuuy]

Beatmap/Circle_size says circle radius equals 54.4 - 4.48 * CS osu pixels. at CS=5, that would equal 32, but the correct value (in both stable and lazer) is actually 32.01312. both clients also display the (rounded) correct value when hovering over difficulty numbers.

the correct formula is: (54.4 - 4.48 * CS) * 1.00041. (this isn't a rounding error (at least not anymore), it's hardcoded in. a comment in lazer's source code explains why)

alternatively, * 1.00041 could be said in a footnote.

reason for change:

• the current page says "Circle size is derived through the following formula", and the following formula is actually an approximation, which is misleading.
• this info can matter if intentionally causing an edge case. example: barely-overlapping streams that require keeping the cursor in the middle pixel(s), where whether a (discrete) screen-pixel counts as within a circle's hitbox can (rarely?) depend on this difference, or you need to know the formula to get your desired radius.

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[cl8n]

it should definitely be explained in the article. I don't remember why we left it in a comment like that (probably just didn't get around to writing about it...)

[MChecaH]

Did some research to ensure the formula was correct. According to CalculateScaleFromCircleSize which scales objects according to a map's CS. An inconsequential amount, but plays into the formula.

[MChecaH]

Before merging though, I think it'd be worth explaining where this ratio comes from in plain text rather than a hidden comment. Believe the ratio should be explained as to not let users wondering "what is this for". Especially when we're already commenting all the other variables in the formula.

[peppy]

I agree that this should not be a hidden comment. Please add the explanation to the actual wiki pages.

[peppy]

As commented