AccountIdOf storage item of pallet authority-members is not used anymore

AccountIdOf could be safely removed if I understand correctly

changed milestone to %Horizon

added P9-somedaymaybe label

changed milestone to %runtime-800

assigned to @c-geek

created branch 151-accountidof-storage-item-of-pallet-authority-members-is-not-used-anymore to address this issue

mentioned in merge request !223 (merged)

mentioned in commit 0b07d3af

mentioned in commit a6c84d69

mentioned in commit 7d74af19

mentioned in commit 91fe5b61

mentioned in commit 600f8f50

mentioned in commit 644aef3f

closed with merge request !223 (merged)