Better space skybox scaling

core/src/mindustry/graphics/g3d/PlanetRenderer.java

@@ -89,8 +89,16 @@ public class PlanetRenderer implements Disposable{
 
         beginBloom();
 
+        //render skybox at 0,0,0
+        Vec3 lastPos = Tmp.v31.set(cam.position);
+        cam.position.setZero();
+        cam.update();
+
         skybox.render(cam.combined);
 
+        cam.position.set(lastPos);
+        cam.update();
+
         Events.fire(Trigger.universeDraw);
 
         renderPlanet(solarSystem);