Core/Common: Merge TimeTrackerSmall with TimeTracker

(cherry picked from commit 228696bf80)

src/common/Collision/DynamicTree.cpp

@@ -103,7 +103,7 @@ struct DynTreeImpl : public ParentTree/*, public Intersectable*/
         }
     }
 
-    TimeTrackerSmall rebalance_timer;
+    TimeTracker rebalance_timer;
     int unbalanced_times;
 };