eth: better active protocol handler tracking (#27665)

Fixes an issue where waitgroups were used erroneously, which could lead to waitgroup being added to while wait was already invoked.

eth/handler_eth.go

@@ -134,7 +134,7 @@ func (h *ethHandler) handleBlockBroadcast(peer *eth.Peer, block *types.Block, td
 	// Update the peer's total difficulty if better than the previous
 	if _, td := peer.Head(); trueTD.Cmp(td) > 0 {
 		peer.SetHead(trueHead, trueTD)
-		h.chainSync.handlePeerEvent(peer)
+		h.chainSync.handlePeerEvent()
 	}
 	return nil
 }