peer-selection: remove not needed subtraction

Local roots are always disjoint with big ledger peers.  This is ensured
when we are adding new big ledger peers and when the local roots has
changed, there's no need to subtract them in `EstablishedPeers.aboveTargetOther`.

ouroboros-network/src/Ouroboros/Network/PeerSelection/Governor/EstablishedPeers.hs

@@ -533,7 +533,6 @@ aboveTargetOther actions
         localWarmPeers      = LocalRootPeers.keysSet localRootPeers
            `Set.intersection` EstablishedPeers.toSet establishedPeers
                        Set.\\ activePeers
-                       Set.\\ bigLedgerPeersSet
         -- One constraint on how many to demote is the difference in the
         -- number we have now vs the target. The other constraint is that
         -- we pick established peers that are not also active. These