Fix test scene log output using `StepButton.ToString()`
Fix test scene log output using `StepButton.ToString()`

ppy/osu-framework,ppy/osu-framework,peppy/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,ppy/osu-framework,smoogipooo/osu-framework