fix overdark default sun ambient setting

Templates/BaseGame/game/tools/worldEditor/gui/objectBuilderGui.ed.gui

@@ -1236,7 +1236,7 @@ function ObjectBuilderGui::buildSun( %this, %dontWarnAboutScatterSky )
 
    %this.addField("direction", "TypeVector", "Direction", "1 1 -1");
    %this.addField("color", "TypeColor", "Sun color", "0.8 0.8 0.8");
-   %this.addField("ambient", "TypeColor", "Ambient color", "0.2 0.2 0.2");   
+   %this.addField("ambient", "TypeColor", "Ambient color", "0.5 0.5 0.5");   
 
    %this.process();