Fix initialization order warning

https://stackoverflow.com/questions/30364585/will-be-initialized-after-wreorder

libraries/entities-renderer/src/RenderableEntityItem.h

@@ -156,7 +156,6 @@ protected:
     std::mutex _materialsLock;
 
     quint64 _created;
-    QUuid _entityID;
 
     // The base class relies on comparing the model transform to the entity transform in order 
     // to trigger an update, so the member must not be visible to derived classes as a modifiable
@@ -166,6 +165,8 @@ protected:
     // i.e. to see if the rendering code needs to update because of a change in state of the 
     // entity.  This forces all the rendering code itself to be independent of the entity
     const EntityItemPointer _entity;
+
+    QUuid _entityID;
 };
 
 template <typename T>