Revert "Expose the skin lookup layers of `SkinManager` to a property"
Revert "Expose the skin lookup layers of `SkinManager` to a property"

This reverts commit 9e652715ced79d2a6f22180c03d3e6024a10da8d.

smoogipoo/osu,NeoAdonis/osu,peppy/osu,UselessToucan/osu,peppy/osu,UselessToucan/osu,NeoAdonis/osu,ppy/osu,smoogipoo/osu,smoogipoo/osu,UselessToucan/osu,ppy/osu,ppy/osu,NeoAdonis/osu,peppy/osu-new,peppy/osu,smoogipooo/osu