Use new change type for update object

To perform jobs for updated animated objects and doors with lowest
priority.

components/detournavigator/asyncnavmeshupdater.hpp

@@ -29,6 +29,7 @@ namespace DetourNavigator
         remove = 0,
         mixed = 1,
         add = 2,
+        update = 3,
     };
 
     class AsyncNavMeshUpdater

components/detournavigator/navmeshmanager.cpp

@@ -46,7 +46,7 @@ namespace DetourNavigator
     {
         if (!mRecastMeshManager.updateObject(id, transform, areaType))
             return false;
-        addChangedTiles(shape, transform, ChangeType::mixed);
+        addChangedTiles(shape, transform, ChangeType::update);
         return true;
     }