[共通] SceneManager: change default transition time (1s-> 2s)
[共通] SceneManager: change default transition time (1s-> 2s)

Siv3D/OpenSiv3D,Siv3D/OpenSiv3D,Siv3D/OpenSiv3D,Siv3D/OpenSiv3D,Siv3D/OpenSiv3D,Siv3D/OpenSiv3D