Improve the UI so that the "Owner" is not displayed when changing the permissions of a sub-folder.

In subfolders that have inherited access rights from the parent folder cannot change the owner to collaborators other than the co-owner.
However, after selecting the folder, select the collaborator shown on the right side of the screen and try to change the access permissions, will visible "Owner" in the menu. And if select "Owner" in the menu, nothing works, which is not a good UI as it can cause confusion when changing access rights.
If change the access permissions in the "Manage Collaborators" screen, the "Owner" is not displayed and cannot be selected for collaborators that cannot be changed to owner so, more convenient to the UI can be changed so that the "owner" is not displayed in collaborators that cannot be changed to the owner, such as the "Manage Collaborators" screen, even outside of the "Manage Collaborators" screen.