Fix LegacyApproachCircle incorrectly applying scaling factor

[peppy]

Simple way of explaining this: it was only supposed to be applied to default skins, but was incorrectly applied everywhere. This was likely an oversight due to the implementation existing in LegacyApproachCircle. But it was in the CreateDefault method which is not used because there's always an approachcircle sprite.

osu/osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyApproachCircle.cs

Lines 44 to 46 in ad6f04c

	// account for the sprite being used for the default approach circle being taken from stable,
	// when hitcircles have 5px padding on each size. this should be removed if we update the sprite.
	drawable.Scale = new Vector2(128 / 118f);

Here's the longer version, which I've also updated the inline comment to:

In triangles and argon, we expanded hitcircles to take up the full 128 px which are clickable, but still use the old approach circle sprite. To make it feel correct (ie. disappear as it collides with the hitcircle, not when it overlaps the border) we need to expand it slightly.

This is what the scale adjust exists to do.

Note that this only affects classic and legacy skins.

Before	After

Closes #27283.