Revert "core: relay key and member id as immutable relay link data (#6711)"

This reverts commit d665b1f5d8.

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -2594,13 +2594,6 @@ func processReceivedMsg(_ res: ChatEvent) async {
                 }
             }
         }
-    case let .groupRelayUpdated(user, groupInfo, member, groupRelay):
-        if active(user) {
-            await MainActor.run {
-                _ = m.upsertGroupMember(groupInfo, member)
-                ChannelRelaysModel.shared.updateRelay(groupInfo, groupRelay)
-            }
-        }
     case let .memberRole(user, groupInfo, byMember: _, member: member, fromRole: _, toRole: _):
         if active(user) {
             await MainActor.run {