Fix effect point scroll speeds below 0.1x not being encoded properly

[bdach]

Add failing test case

Demonstrates failure in LegacyBeatmapEncoderTest.

Fix LegacyBeatmapEncoderTest swapping expected/actual values around

Was making test output look confusing.

Fix effect point scroll speeds below 0.1x not being encoded properly

Closes #30472.

Caused by mismatching bounds between

osu/osu.Game/Beatmaps/ControlPoints/EffectControlPoint.cs

Lines 22 to 26 in 2bd12e1

	public readonly BindableDouble ScrollSpeedBindable = new BindableDouble(1)
	{
	MinValue = 0.01,
	MaxValue = 10
	};

and

osu/osu.Game/Beatmaps/ControlPoints/DifficultyControlPoint.cs

Lines 24 to 28 in 2bd12e1

	public readonly BindableDouble SliderVelocityBindable = new BindableDouble(1)
	{
	MinValue = 0.1,
	MaxValue = 10
	};