The functions renounceOwnership() or LSP0ERC725AccountCore can be called by a controller and the permissions of the controller are then checked via _verifyCall. This calls _verifyPermissions(), which allows for transferOwnership() and acceptOwnership(), but doesnt allow for renounceOwnership().
This means  renounceOwnership() can only be done via the owner of the KeyManager and not via a controller.
LSP0ERC725AccountCore.sol#L655-L679
LSP6KeyManagerCore.sol#L455-L511
Determine if a controller should be able to renounceOwnership. If so, update _verifyPermissions() to allow this. If not, remove the code from renounceOwnership() that prepares for this (e.g. the call to _verifyCall()).
