SetActiveScene after loading the scene

[whynames]

Since there was an empty scene to prevent exceptions, unity sets that scene as active scene and all its rendering settings were applied. I added a line that sets the active scene after loading

[mackysoft]

Hi @whynames
Thanks for the pull request.

I tried to think of a solution, but since I believe that in principle Navigathena should not switch active scenes, I decided to solve this problem in the following way. #16

This switching occurs only when there is a single scene present, thus minimizing the impact on the project.

If you need anything else, please contact me.

[mackysoft]

Latest release that include this fix is here.
https://github.com/mackysoft/Navigathena/releases/tag/1.1.0