Correct scale of taiko-glow element to match stable

[Joppe27]

Closes #27700.

This was incorrect from from the start (see #21459). I used the values from stable in the original PR, but it turns out they don't match 1:1 (this was even brought up at the time). I did a more thorough visual check this time around to get it right.

master	this PR	stable

[smoogipoo]

I'm not sure where 0.8 is coming from, stable uses 0.7 as mentioned in the original PR #21459 (comment) and as I've just confirmed...

s_KiaiGlow = new pSprite(TextureManager.Load(@"taiko-glow", SkinSource.Skin | SkinSource.Osu), Fields.GamefieldWide, Origins.Centre, Clocks.Game, HitObjectManagerTaiko.HIT_LOCATION, 0.02f, true, new Color(255, 228, 0, 0));
s_KiaiGlow.Scale = 0.7f;

internal override void OnKiaiToggle(bool active)
{
    if (active)
    {
        s_KiaiGlow.Transformations.Clear();
        s_KiaiGlow.FadeIn(100);
        s_KiaiGlow.Transformations.Add(new Transformation(TransformationType.Scale, 0.1f, 0.7f, GameBase.Time, GameBase.Time + 120, EasingTypes.Out));
        s_BarRight_Kiai.FadeIn(150);
    }
    else
    {
        s_KiaiGlow.Transformations.Clear();
        s_KiaiGlow.FadeOut(600);
    }

if (Player.KiaiActive)
{
    s_KiaiGlow.Transformations.RemoveAll(t => t.Type == TransformationType.Scale);
    s_KiaiGlow.Transformations.Add(new Transformation(TransformationType.Scale, 0.85f, 0.7f, GameBase.Time, GameBase.Time + 80, EasingTypes.Out));
}

[Joppe27]

I'm well aware stable used 0.7, as I said I used that value in my original implementation. It clearly doesn't match visually though, which is why #27700 exists in the first place. The 0.8 value is based on the scale of the inner circle of the hit target in lazer, which I assume is what taiko-glow is supposed to surround:

osu/osu.Game.Rulesets.Taiko/Skinning/Legacy/TaikoLegacyHitTarget.cs

Lines 30 to 37 in d55fa42

	new Sprite
	{
	Texture = skin.GetTexture("taikobigcircle"),
	Scale = new Vector2(0.8f),
	Alpha = 0.22f, // eyeballed to match stable
	Anchor = Anchor.Centre,
	Origin = Anchor.Centre,
	},

I then double-checked this by making a visual comparison, and as you can see in the pictures this seems to check out.

[peppy]

I'm not sure where 0.8 is coming from, stable uses 0.7 as mentioned in the original PR #21459 (comment) and as I've just confirmed...

I spent half an hour and couldn't figure this out. But the change in this PR does match visually, and also matches the scale applied to the hit target:

https://github.com/peppy/osu-stable-reference/blob/7519cafd1823f1879c0d9c991ba0e5c7fd3bfa02/osu!/GameModes/Play/Rulesets/Taiko/RulesetTaiko.cs#L592

Let's just go with it for now.