[WP-H12] forceUnsponsor() may open a window for attackers to manipulate the _totalShares and freeze users' funds at a certain deposit amount

Handle WatchPug Vulnerability details if force && sponsorAmount totalUnderlying sponsorToTransfer = totalUnderlying; else if !force require sponsorToTransfer totalUnderlying, the contract will transfer totalUnderlying to sponsorToTransfer, even if there are other depositors and totalShares 0. Aft...