[Delver] section.dat overwriting settings

Summary

For generator/Dungeon/section.dat and generator/Undead/section.dat the properties fogStart and fogEnd are defined multiple times instead of once.

Example (Dungeon):

levelTemplates: [
    {
        fogStart:2,
        fogEnd:18,
        theme:"DUNGEON",
        fogStart:1.925,
        fogEnd:16.039,
    }
],

I'm pretty sure we are guilty of this in many places. 🙃