Fixes bad generated code that breaks the build

Physics is wired differently, this appears to have no functional effect

Author: Cervator

engine/src/main/java/org/terasology/engine/physics/bullet/BulletPhysics.java

@@ -83,7 +83,6 @@
 /**
  * Physics engine implementation using TeraBullet (a customised version of JBullet).
  */
-@RegisterSystem
 public class BulletPhysics implements PhysicsEngine, Physics {
     public static final int AABB_SIZE = Integer.MAX_VALUE;