Remove incorrect russion roulette. (#1019)

Setting rayDepth to 1 -> light cannot bounce off the ground, thus everything but the sky is black.
Setting rayDepth to 2 -> light can bounce off of the ground/blocks, but cannot bounce off of anything else. Emitters do not work.
Setting rayDepth to 3 -> hey look, torches give off light now!
Setting rayDepth to 4 -> the start of indirect illumination from emitters...

chunky/src/java/se/llbit/chunky/renderer/scene/Scene.java

@@ -811,12 +811,12 @@ public void updateOpacity(Ray ray) {
   }
 
   /**
-   * Test if the ray should be killed (using Russian Roulette).
+   * Test if the ray should be killed <strike>(using Russian Roulette)</strike>.
    *
    * @return {@code true} if the ray needs to die now
    */
   public final boolean kill(int depth, Random random) {
-    return depth >= rayDepth && random.nextDouble() < .5f;
+    return depth >= rayDepth;
   }
 
   /**