[INTERNAL] Lazy Loading timer needs to be cleaned
[INTERNAL] Lazy Loading timer needs to be cleaned

- When the ObjectPageLayout is destroyed the lazy loader is kept forever.
- Now making sure it's really removed

Change-Id: If78b76066649b38e85f7704d57ab92a30601f8d1

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5