Extra dot in the world generation exportation path

There is an extra dot in the path of the world generation settings export toast/notification.

To reproduce:
1. Create a world or go to an existing world.
2. Click on Export world generation settings. 
3. You see that there is a extra dot between the world name and the world generation settings file, or \saves\worldname\.\worldgen_settings_export.json

Expectation:
There would not be a dot in between the worldname and the worldgen settings file. 

Below, there is a picture showing the unkown dot, I have hidden the full path for privacy reasons.