nix: Remove obsolete traces from config

Author: jutaro

nix/workbench/service/tracing.nix

@@ -97,10 +97,8 @@ let
       ## Silencing the tracers below aims at having a comparable log line rates (msgs per second) on UTxO-HD and regular nodes.
       "ChainDB.LedgerEvent.Forker".severity = "Silence";
       "Mempool.AttemptAdd".severity = "Silence";
-      "Mempool.AttemptingSync".severity = "Silence";
       "Mempool.LedgerFound".severity = "Silence";
       "Mempool.LedgerNotFound".severity = "Silence";
-      "Mempool.SyncDone".severity = "Silence";
       "Mempool.SyncNotNeeded".severity = "Silence";
 
       ## enable this to investigate tx validation errors, e.g. fee to small for Plutus script txns