fix gun timing

Project/Assets/ML-Agents/Examples/FPS_Game/Scripts/MultiGunAlternating.cs

         //        {
         if (autoShootEnabled)
         {
-            ShootGunAtIndex(currentGunIndex);
+            //            ShootGunAtIndex(currentGunIndex);
+            Shoot();
-            ShootGunAtIndex(currentGunIndex);
+            //            ShootGunAtIndex(currentGunIndex);
+            Shoot();
         }
         //        }
         shootTimer += Time.fixedDeltaTime;