Change the account associated with a registrar.
The dispatch origin for this call must be Signed and the sender must be the account of the registrar whose index is index.
index
new
Change the account associated with a registrar.
The dispatch origin for this call must be Signed and the sender must be the account of the registrar whose index is
index.index: the index of the registrar whose fee is to be set.new: the new account ID.