Invited user to a Author profile can remove the owner of that Author

##SUMMURY: ------------------------------------- A user invite another user to his author by giving ownership. ------------------ Later invited user can completely remove the real owner from that author . ------------------- ----------------------------------- ##STEP TO REPRODUCE: ----------------------------- 1. Create two user ABC and XYZ. -------------------- 2. Create a author profile in user ABC and invite user XYZ to that author using public_id. Give the ownership to user XYZ.Now user XYZ has full access to that author profile. --------------------- 3. Now goto user XYZ account and remove user ABC from that author. --------------- And see ABC is owner of that author is completely removed from that author and ABC user cant able to access that Author. --------------- 4. finally user XYZ is the main owner of that author ------------ ----------------------- ##FIX: -------------------------------- check before invited user try to remove real owner from his Author profile. ----------- if so , access denied that invited user cant delete real owner from his author profile. ---------