remove unnecessary async

Author: dario-piotrowicz

lib/repl.js

@@ -1336,7 +1336,7 @@ function completeFSFunctions(match) {
 // getter code. To avoid potential triggering side-effects with getters the completion
 // logic is skipped when getters or proxies are involved in the expression.
 // (see: https://github.com/nodejs/node/issues/57829).
-async function complete(line, callback) {
+function complete(line, callback) {
   // List of completion lists, one for each inheritance "level"
   let completionGroups = [];
   let completeOn, group;