submitApi: simplify the cfg declaration

Author: johnalotoski

cardano-lib/default.nix

@@ -133,18 +133,14 @@ let
   mkSubmitApiConfig = name: nodeConfig: (filterAttrs (k: v: v != null) {
     GenesisHash = nodeConfig.ByronGenesisHash;
     inherit (nodeConfig) RequiresNetworkMagic;
-    TraceOptions = builtins.listToAttrs [
-      { name = "";
-        value = {
-          backends = [
-            "EKGBackend"
-            "Stdout HumanFormatColoured"
-          ];
-          detail = "DNormal";
-          severity = "Info";
-        };
-      }
-    ];
+    TraceOptions."" = {
+      backends = [
+        "EKGBackend"
+        "Stdout HumanFormatColoured"
+      ];
+      detail = "DNormal";
+      severity = "Info";
+    };
   })
   // defaultExplorerLogConfig;