Model Renderer: Don't delete objects during deletion notification

There is a chance that the object being deleted will still be later
notified, so it's better to ensure that deletion occurs after everyone
has been notified.

doomsday/apps/client/src/render/playerweaponanimator.cpp

@@ -65,7 +65,7 @@ DENG2_PIMPL_NOREF(PlayerWeaponAnimator)
 
     void assetBeingDeleted(Asset &)
     {
-        animator.reset();
+        de::trash(animator.release());
         modelAuxData = nullptr;
     }