update night lighting

res/shaders/lib/commons.glsl

@@ -17,7 +17,7 @@ vec3 pick_sky_color(samplerCube cubemap) {
     vec3 skyLightColor = texture(cubemap, vec3(0.4f, 0.0f, 0.4f)).rgb;
     skyLightColor *= SKY_LIGHT_TINT;
     skyLightColor = min(vec3(1.0), skyLightColor*SKY_LIGHT_MUL);
-    skyLightColor = max(MAX_SKY_LIGHT, skyLightColor);
+    skyLightColor = max(MIN_SKY_LIGHT, skyLightColor);
     return skyLightColor;
 }