feat: Make quadratic falloff the default

src/render/featureutil.cpp

@@ -28,7 +28,7 @@ namespace render {
 static unordered_map<Feature, int> g_features {
     { Feature::PBR, 0 },
     { Feature::HDR, 0 },
-    { Feature::Falloff, 0 },
+    { Feature::Falloff, 1 },
     { Feature::DynamicRoomLighting, 0 },
     { Feature::SelfIllumAsLights, 0 }
 };