tls: simplify enableTrace logic

PR-URL: #27497
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/_tls_wrap.js

@@ -998,13 +998,12 @@ function Server(options, listener) {
   }
 
   const enableTrace = options.enableTrace;
-  if (enableTrace === true)
-    this[kEnableTrace] = true;
-  else if (enableTrace === false || enableTrace == null)
-    ;  // Tracing explicitly disabled, or defaulting to disabled.
-  else
+  if (typeof enableTrace === 'boolean') {
+    this[kEnableTrace] = enableTrace;
+  } else if (enableTrace != null) {
     throw new ERR_INVALID_ARG_TYPE(
       'options.enableTrace', 'boolean', enableTrace);
+  }
 }
 
 Object.setPrototypeOf(Server.prototype, net.Server.prototype);